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Huey M Mcnulty T Article Re Prison Suicide Deprivation and Overcrowding

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THE PRISON
10.1177/0032885505282258
Huey,
McNultyJOURNAL
/ PRISON /SUICIDE
December 2005

INSTITUTIONAL CONDITIONS
AND PRISON SUICIDE:
CONDITIONAL EFFECTS OF
DEPRIVATION AND OVERCROWDING
MEREDITH P. HUEY
THOMAS L. MCNULTY
The University of Georgia

This article uses national data on prisons in the United States to examine the effects of
deprivation, overcrowding, and their interaction on the likelihood of prison suicide.
Our central argument is that overcrowding is a pivotal feature of prison environments
that conditions the effects of deprivation. Findings provide substantial support for
this hypothesis. For example, at low levels of overcrowding, minimum-security facilities evidence a lower probability of prison suicide, but at high levels, they are as likely
to experience a suicide as their medium- and maximum-security counterparts. Theoretical and policy implications of the findings are discussed.

Keywords:

prison suicide; deprivation; overcrowding

In the United States, suicide rates among prison inmates are higher than in
the general population and suicide accounts for more than half of all deaths in
custody (Kupers, 1999). Prison suicide is of important interest to researchers
investigating the effects of incarceration on inmate adjustment to life in total
institutions. Prior research has focused on the individual characteristics of
inmates as explanatory variables, particularly indicators of mental health
(Anno, 1985; California Department of Corrections, 1991; Jones, 1986;
Lloyd, 1992; New York State Department of Correctional Services, 1994;
Skegg & Cox, 1991).1 This focus is related to the “medicalization” of suicide,
the assumptions of which are evident in both popular stereotypes and explanations of inmate suicide put forth by social scientists and policy makers.
The causes of suicide are widely assumed to reflect underlying mental and
emotional disorders, and hence public policy “seeks to change potential vic-

THE PRISON JOURNAL, Vol. 85 No. 4, December 2005 490-514
DOI: 10.1177/0032885505282258
© 2005 Sage Publications

490

Huey, McNulty / PRISON SUICIDE

491

tims,” with emphasis on the prediction, prevention, and treatment of suicidal
prisoners (Conrad, 1980; Hayes, 1995, 1999).
Although this research has provided the basis for suicide prediction and
prevention strategies, the exclusive focus on an individual level of explanation has obscured attention to the larger institutional context in which the
event occurs (Lester & Danto, 1993). As Liebling (1995, 1999) has noted, a
preoccupation with the individual is conceptually limited, and the individual
prediction approach has not succeeded in either understanding or preventing inmate suicide. Thus, there is a need for theory and research that moves
beyond the medicalization model toward an understanding of prison suicide
in terms of the institutional conditions under which inmates are held.
As a means to advance the literature, this article uses national data on U.S.
prisons (1990 and 1995) to evaluate the effect of prison characteristics on the
likelihood of suicide. Whereas prior research has described the problem as
inmate suicide, we use the term prison suicide, which better captures that
individual actions are embedded in social contexts.2 Specifically, we focus
on the effects of deprivation, overcrowding, and the interaction between
them on the likelihood of prison suicide. Deprivation theory predicts that
prisons in which inmates experience a greater loss of freedom, have lesser
control over daily routines, and are denied access to rehabilitative programs
will have a higher incidence of suicide. Overcrowding theory stresses the
deleterious effects of crowding on inmate adaptation to prison life, one consequence of which is a greater likelihood of suicide. Central to our argument
is that overcrowding is a pivotal factor that conditions the effects of deprivation on prison suicide. This possibility has been left unexplored in prior
research, despite widely assumed detrimental repercussions of overcrowding in an era in which many prisons routinely operate over capacity (Kupers,
1999). The following sections discuss our conceptual framework in more
detail.
THEORETICAL BACKGROUND
DEPRIVATION THEORY

Deprivation of freedom has long been argued to be a primary explanation
of violence in prisons and other institutions (e.g., Ellenberger, 1971;
Suedfeld, 1977; Sykes, 1958). The classic work of Glass and Singer (1972),
supported by later research (Moos, 1976), has shown that the unpredictability of, and lack of control over, environmental inputs are significant causes of
behavioral breakdown. Research generally supports the prediction that pris-

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THE PRISON JOURNAL / December 2005

ons in which inmates experience greater deprivation and loss of control over
personal autonomy have a greater likelihood of suicide. The most common
indicator of deprivation in prior research has been the prison security-level.
Salive, Smith, and Brewer (1989), for example, argue that maximumsecurity facilities exemplify deprivation and loss of control and hence have a
higher incidence of suicide compared to minimum- and medium-security
prisons (Adams, 1992; Liebling, 1999). Other studies, however, have found
exceptions to this pattern across security levels (Skegg & Cox, 1991; Zamble
& Porporino, 1988).
Research indicates that inmates adapt better to life in prison when they are
allowed some measure of control over the immediate environment—which
is less likely in high-security settings (Canter, 1987; Moos, 1970, 1975;
Toch, 1985; Wright & Goodstein, 1989). In a study of the Texas, California,
and Michigan prison systems, DiIulio (1987) reports that prisons characterized by order and security tend to experience less violence. Yet, prison facilities that remove the opportunity for inmate violence through strict social
control also produce serious dehumanizing effects on inmates that, in turn,
increase the likelihood of suicide (DiIulio, 1987). Liebling (1995, 1999),
based on research in the United Kingdom, also finds that inmates entering
high-security prisons tend to adapt slowly and that suicide is most common
among those who cope poorly with features of the prison environment.
One explanation for the higher incidence of suicide in maximum-security
prisons is the social isolation experienced by inmates, both within the prison
itself and from loved ones on the outside. Based on extensive interview data,
Kupers (1999) concludes that disconnection from family is a primary reason
given for suicide attempts and that a majority of inmates who make serious
attempts are distraught about their ability to cope with a lengthy sentence
separated from loved ones. This separation is argued to be an important factor affecting inmate adjustment to prison life and may be more acute in
higher security settings because visitation is more strictly controlled and
curtailed (Kupers, 1999).
Deprivation has also been argued to increase the likelihood of suicide by
inhibiting the development of inmate social networks and informal groups
within the prison (e.g., Clemmer, 1958; Goffman, 1961; Payson, 1975).
Inmates seek out friendship networks for social support and protection and to
alleviate the “pains of imprisonment” (Sykes, 1958). This mutual support
reduces uncertainty and fear, while increasing inmates’ sense of control over
the prison environment. Salive et al. (1989), based on a study of suicides in
the Maryland prison system, argue that informal inmate networks are less
likely to develop in maximum—rather than in minimum/medium—security
facilities because inmates are more often housed in single cells and for longer

Huey, McNulty / PRISON SUICIDE

493

periods of the day, lessening the opportunity for social interaction and the
provision of social support. In addition, the actual opportunity to succeed in
committing suicide is greater because guardianship (e.g., the intervention of
another inmate) is less likely when inmates are isolated in separate cells.
Related research documents that suicides occur most often among inmates confined in isolation or single cells (Kupers, 1999). Green, Andre,
Kendall, Looman, and Plovi (1992) find that one third of the 133 suicides in
Canadian Federal Prisons from 1990 to 1991 occurred in protective
segregations; 1 in 10 were in punitive isolation at the time of death. In a
review of Italian prison suicides for 1996 and 1997, Tatarelli et al. (1999)
report that 20% of the inmates who committed suicide were in isolation cells
and 40% in single cells. Anno (1985), based on a 5-year study of suicides in
the Texas penal system, also finds that a vast majority of prison suicide victims are housed in single cells. Lester (1990) shows as well for U.S. prisons
that suicide rates are negatively associated with the percentage of inmates in
multiple occupancy cells (see also Cox, Paulus, & McCain, 1984; Jones,
1986; Marcus & Alcabes, 1993; White & Schimmel, 1995; Winkler, 1992).
Another aspect of deprivation is the extent to which prison facilities provide inmates with access to rehabilitation and other programs designed to
facilitate transition to life outside prison, including psychological/mental
health counseling, education programs, and work skills training. Suicide
may be more likely in prison environments that lack or provide limited
access to such programs because of heightened idleness, isolation, and sense
of fatalism among inmates. Through a process of contagion, this may create
an antagonistic social atmosphere of frustration and indifference that affects
both inmates and staff. This atmosphere may reinforce punitive attitudes
among correctional staff and diminish their sensitivity to cues of impending
suicide, which are interpreted instead as inmate “manipulation” or “misbehavior” deserving of further punishment (Kupers, 1999). Ironically, this
punishment typically entails administrative segregation in isolation cells—
precisely where suicides are most likely to occur. Under conditions of tight
fiscal constraints, prison systems (federal, state, and private) have eliminated
rehabilitative programs in recent years, one consequence of which may be a
significantly elevated probability of prison suicide.
OVERCROWDING THEORY

Prison overcrowding is currently an extremely pertinent theoretical and
policy issue, as many prisons nationwide routinely operate over capacity. It is
widely assumed in the literature—reinforced through court decisions—that
overcrowding exerts deleterious effects on the psychological and behavioral

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THE PRISON JOURNAL / December 2005

well-being of inmates.3 Toch (1985) argues that overcrowding amounts to
warehousing, where inmates are denied essential subsistence services and
correctional rehabilitation. A former inmate and prison activist details these
system deficiencies in a personal account of his experience incarcerated in an
overcrowded, maximum-security prison (Cobb, 1985). His ethnography
reveals deficient medical attention, diminished security, lack of access to
rehabilitative programs, and relentless idleness as primary correlates of
overcrowding.
Evaluations of crowding effects have produced somewhat mixed results
with respect to whether overcrowding has a direct effect on prison suicide
and other forms of violence (Ekland-Olson, 1986; Ellis, 1984; Lester, 1990).
Yet, several studies support the hypothesis that the stress of crowding—and
the accompanying struggles for resources, space, and personal autonomy—
create atmospheres that impede inmate adaptation to prison life and increase
the likelihood of suicide (Gaes, 1992). Further, access to rehabilitation, education, and other programs may be more limited in overcrowded settings,
adding to inmate idleness and frustration that may, in turn, heighten the
probability of a suicide occurring.
In an evaluation of 527 U.S. prisons for the years 1979-1984, Innes (1987)
finds that increases in inmate populations are significantly associated with
increases in the number of suicides. Cox et al. (1984) examine rates of suicide in the Illinois, Mississippi, Oklahoma, and Texas prison systems from
the early 1950s to the late 1970s, and similarly find that prison overcrowding
is associated with increases in suicide rates. Although these findings are consistent with the predictions of overcrowding theory, not all of the research has
been supportive (see Farrington & Nuttall, 1980; Greenfeld, 1982; Lebowitz
& Pospichal, 1979; McCain, Cox, & Paulus, 1980).
CONDITIONAL EFFECTS OF
DEPRIVATION AND OVERCROWDING

In treating deprivation and overcrowding as distinct sets of processes,
prior theory and research have not considered the potentially more complex
manner by which these factors might influence the likelihood of suicide. In
particular, prison suicide studies have not examined whether deprivation and
overcrowding processes are mutually dependent in their effects. Our central
argument, and the principal hypothesis tested below, is that overcrowding is
a pivotal factor that conditions the effect of differences in deprivation on
prison suicide.
Deprivation theory predicts, consistent with prior research, that mediumand maximum-security prisons have a greater likelihood of suicide than

Huey, McNulty / PRISON SUICIDE

495

minimum-security facilities (and maximum more than medium security).
Yet, although levels tend to be lower, the effect of overcrowding may be more
pronounced in minimum-security prisons because in higher security settings, both deprivation and overcrowding tend to be more severe, and hence
the effect of increases in the latter is more attenuated. This variation in the
effect of overcrowding may account for the differential risk for suicide
across levels of deprivation documented in previous studies.
The hypothesis implies that the greater likelihood of suicide in mediumand maximum-security facilities observed in prior research will be most evident at low levels of overcrowding and hence indicative of differences in
deprivation. Conditions of high overcrowding, however, may negate the
reduced likelihood of suicide evident in minimum-security facilities. That is,
among prisons operating over capacity, differences in deprivation are less
important, and minimum-security prisons are as likely to experience a suicide as their higher security counterparts. Our argument points to overcrowding as a critical feature of prison environments that must be considered in
conjunction with deprivation in prison life.
DATA AND METHOD
DATA AND SAMPLE

The data are drawn from the fourth and fifth enumerations of the Census
of State and Federal Adult Correctional Facilities (CCF), collected in 1990
and 1995 by the U.S. Census Bureau on behalf of the U.S. Department of Justice and Bureau of Justice Statistics (1993, 1998). These censuses represent
the most comprehensive national collections available, including coverage
of 1,287 state, federal, and private facilities in 1990 and 1,500 in 1995. Each
census provides information on prison conditions, including inmate population size, design capacity, security level, facility design, operational authority, rehabilitative programs offered, and the level of inmate participation in
them. Data on the cause of inmate deaths are also available, including those
due to suicide.
In the analysis presented below, we combine information from the two
years and predict the incidence of prison suicide in 1995 with independent
variables drawn from the 1990 census, including a (lagged) measure of the
incidence of suicide in 1990. After identifying prisons that participated in
both years, and eliminating a few cases with missing data, the sample for the
analysis includes 1,118 facilities nationwide.

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THE PRISON JOURNAL / December 2005

DEPENDENT VARIABLE

Given that suicide is in general a rare event, we use a binary outcome that
distinguishes prisons that had no suicides (coded 0) and those that had at least
one reported suicide in 1995 (coded 1). The lagged measure of suicide in
1990 is calculated analogously. Examination of the frequency distribution
for numbers of suicides suggests that this procedure is reasonable. Most of
the prisons report no suicides in either year, and among those who have, most
have experienced only one or two episodes (summed across both years, the
maximum number in our data is six). Thus, we draw the distinction between
prisons that have or have not experienced a suicide, and downplay the very
limited variation among those who have. Accordingly, logistic regression is
used to estimate the log-odds of prison suicide in 1995 as a function of
deprivation, overcrowding, and control variables.
DEPRIVATION AND OVERCROWDING MEASURES

We include two indicators of deprivation that have been widely used in
prior research. Security level is represented by dummy-coded variables distinguishing maximum-, medium-, and minimum-security prisons (the reference). Our second indicator is the percentage of inmates participating in
psychological/mental health counseling, self-help groups, and educational
and work skills training/release programs.
Overcrowding is indicated by a standardized index including (a) the total
size of the inmate population, (b) the difference between the total number of
inmates and the design capacity of the prison, and (c) the difference between
the number of inmates and the number of correctional staff. This measure
captures not only the total size of inmate populations but also the size relative
to both the prison’s capacity and correctional staff. It thus provides a good
indicator of overcrowding and the extent to which prisons are operating over
or under capacity. The component measures are highly correlated (in excess
of .75), load on a common factor, and the resulting index has excellent reliability (alpha = .91).
To assess conditional effects, product terms are formed between the
security-level dummy variables and the overcrowding index, following the
procedures outlined by Aiken and West (1991).4 Note that because the overcrowding index is normalized with a mean of zero, the main effects of the
security-level variables (medium, maximum) will reflect the difference in
the log-odds of suicide (relative to minimum) at the grand mean of overcrowding (see Aiken & West, 1991). We probe the interaction further by
examining variation in the security-level effects at one-half standard devia-

Huey, McNulty / PRISON SUICIDE

497

tion above and below the grand mean. Appendix A in appendices shows the
distribution of minimum-, medium-, and maximum-security prisons across
these levels of overcrowding.5
CONTROL VARIABLES

The analysis includes several control variables suggested in prior research
to be predictive of prison suicide. As noted, we include a binary measure
coded 1 for prisons that experienced suicides in 1990 as a means to control
for stability (and potential randomness) in the likelihood of suicide overtime.
As an additional control for the risk of experiencing a suicide, we include a
binary variable that compares prisons with (coded 1) and without (coded 0)
psychiatric facilities on site. Persons at risk of suicide are more often
assigned to prisons with on-site psychiatric facilities, and hence it is essential
to control for this differential risk across prisons in the multivariate analysis.6
We also control for facility age in years (since first construction), perhaps
indicative of the general physical and aesthetic quality of the prison setting.
The gender composition of prisons is indicated by a set of dummy-coded
variables distinguishing male-only prisons (reference), female-only prisons,
and facilities that house both male and female inmates. Research suggests
that suicide is more likely when inmates are housed in single cells, and hence
we include dummy variables contrasting prisons with single-cell occupancy,
multiple-cell occupancy (e.g., two-person), and those with dormitory-style
housing (the reference). Finally, given preliminary analysis indicating variation in prison suicide with region and operational authority, we include indicators distinguishing prisons located in the North, South, West, and Midwest
(reference), and between prisons under federal, private, and state (reference)
authority.
SENSITIVITY ANALYSES

To assess the robustness of the findings reported below, we have conducted extensive sensitivity analyses exploring a variety of alternative model
specifications. First, we replicated the analysis of prison suicide in 1995,
including the lagged dependent variable, but with the remaining predictors
drawn from the 1995 (rather than 1990) census. Although these analyses lead
to substantively similar conclusions, we regard the models with 1990 predictors as more judicious for several reasons. First, prison overcrowding
increased significantly between 1990 and 1995 (t = 11.78; p < .000), and
hence the estimate of the effect of overcrowding in 1990 on the log-odds of
suicide in 1995 is more conservative. The 1995 data also do not include

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THE PRISON JOURNAL / December 2005

important predictors available in the earlier census, including whether the
prison has a psychiatric facility and levels of inmate participation in psychological counseling and other rehabilitative programs. Finally, employing
1990 predictors circumvents any potential causal order issues and makes
optimal use of the longitudinal data.
Second, we combined information from the two years and predicted the
incidence of prison suicide in 1990 and/or 1995 with independent variables
drawn from the 1990 census. An advantage of this approach is reduction in
skew in the dependent variable. Third, we estimated separate cross-sectional
models for 1990 and 1995. These analyses are not directly comparable, however, because identical indicators of some of the predictors are not available
in both years. Nevertheless, these various model specifications lead to results
that are substantively parallel to those reported below with regard to our key
theoretical hypotheses, providing substantial confidence in the conclusions
we draw.
ANALYTIC STRATEGY

Following a brief review of descriptive statistics, we estimate a series of
five logistic regression equations predicting the log-odds of prison suicide.
We begin with a model including the control variables and the percentage of
inmates participating in rehabilitation programs (we include the latter at
baseline as a means to illustrate its effect). The second and third models,
respectively, incorporate the security-level indicators and the overcrowding
index, and the fourth presents a fully specified equation including both sets
of measures. This analytic structure allows us to compare their distinctive
contributions to an explanation of prison suicide and their potential role in
mediating the effects of other predictors. Central to our theoretical argument
is the interaction effect between security level and overcrowding on suicide,
the product terms for which are incorporated in the fifth and final model.
RESULTS
DESCRIPTIVE STATISTICS

Table 1 presents means and standard deviations for variables included in
the analysis (Appendix B in appendices displays correlations). Approximately 10% of U.S. prisons experienced at least one suicide in both 1990 and
1995. About 15% of the prisons have psychiatric facilities on site and likely
house more inmates at high risk of suicide. The average age of U.S. prisons is

Huey, McNulty / PRISON SUICIDE

499

TABLE 1: Means and Standard Deviations for Variables

M
Suicide 1995
Suicide 1990
Psychiatric facility
Facility age
Female prison a
Both male and female
Single occupancy b
Multiple occupancy
North c
South
West
Federal authority d
Private authority
Percentage participating
Maximum security e
Medium security
Overcrowding

.10
.09
.15
36.81
.08
.09
.17
.42
.16
.45
.19
.05
.05
63.01
.19
.34
.00

SD
.30
.28
.35
31.74
.27
.29
.37
.49
.36
.50
.39
.22
.22
22.60
.39
.47
2.79

NOTE: N of cases = 1,118.
a. Reference is male prisons.
b. Reference is dormitory housing.
c. Reference is Midwest.
d. Reference is state authority.
e. Reference is minimum security.

approximately 36 years, although there is considerable variation around this
value. It is not surprising that the majority of prisons house males (83%),
whereas 8% are female-only facilities and 9% house both males and females.
With respect to occupancy, 17% of prison facilities house inmates in single
cells, 42% provide for multiple occupancy, with the remaining 41% having
dormitory-style housing (most common in minimum- and to a lesser extent
medium-security prisons).
Regionally, Northern states make up 16% of U.S. facilities, predominantly concentrated in Pennsylvania, New York, and New Jersey. The South
has the largest number of prisons, making up 45% of the total nationwide.
North Carolina has the most prisons of any state, nearly one facility per
county. The West makes up 19% of all U.S. prisons, accounted for principally by California, which has a relatively large number of facilities compared to other Western states. Twenty percent of U.S. prisons are located in
the Midwest, led by Illinois, Michigan, and Ohio in terms of numbers of
prisons.
Most U.S. prisons are under state authority (90%), with the federal and
private systems making up 5% each of prison facilities. Approximately 63%

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THE PRISON JOURNAL / December 2005

FIGURE 1: Distribution of U.S. Prisons and Incidence of Suicide by State

of inmates in U.S. prisons in 1990 were participating in educational, work
release, or rehabilitation programs, including psychological counseling and
self-help groups. The majority of facilities are minimum-security (47%), followed by medium-security (34%) and maximum-security (19%) prisons.
With regard to overcrowding, 45% (507) of prisons fall within one-half of
one standard deviation of the mean, 18% (200) have values greater than onehalf of one standard deviation above, and 37% (411) have values one-half or
more standard deviation units below the mean (see Appendix A). This indicates that a substantial number of prisons are operating at or above capacity,
with many well above.
Figure 1 shows the distribution of U.S. prisons and the incidence of prison
suicide by state. For illustrative purposes, this figure combines numbers of
suicides in 1990 and 1995. The incidence of suicide is lowest in the South—
although it has the largest number of prisons—with 11% of prisons in the
region experiencing at least one suicide. Suicides were most common in prisons located in the Midwest, with 23% experiencing at least one (a figure primarily driven by Michigan and Illinois). About 15% to 16% of prisons in the
North and West had at least one suicide in 1990 and/or 1995, accounted for
mainly by Pennsylvania, New York, New Jersey, and California.

Huey, McNulty / PRISON SUICIDE

501

2.00

Mean Overcrowding by Suicide 1990/95

1.50
1.42
1.00

1.04
.42

.50
.19
0.00

.03

-.50

-1.00
-1.29
-1.50
-2.00
minimum

medium

maximum

FIGURE 2: Mean Overcrowding and Suicide by Security Level

Considering the incidence of suicide by state, California, Michigan, and
Pennsylvania had the greatest number, led by California with 37 suicides in
1990/1995. Texas, Illinois, New York, and New Jersey follow, each experiencing between 10 and 17 prison suicides in the two years (led by Texas with
17). Ohio, Georgia, Florida, Louisiana, Oklahoma, and Arizona also had
comparatively high numbers of suicides (6 to 9). The only states that did not
have any prison suicides were Idaho, Wyoming, and North Dakota, each of
which has few prison facilities. Although numbers of suicides are related to
the number of prisons in states, this is not always the case. For example, Arizona, with only nine prisons, experienced 9 suicides (1 per prison), whereas
North Carolina had only 3 suicides despite having more prisons than any
other state nationwide.

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THE PRISON JOURNAL / December 2005

Figure 2 displays mean levels of overcrowding by the proportion of minimum-, medium-, and maximum-security prisons that experienced at least
one suicide in 1990 and/or 1995. Consistent with deprivation theory, suicide
is most common in maximum-security (42%), followed by medium-security
(19%) and minimum-security facilities (3%). This figure also shows that levels of overcrowding are lowest in minimum-security (–1.29) and highest in
maximum-security prisons (1.42) and that as overcrowding increases, the
proportion of prisons experiencing a suicide increases dramatically (from
3% in minimum- to 19% in medium- to 42% in maximum-security facilities). Indeed, all of the prisons that had at least one suicide have values on the
overcrowding index above the grand mean, with the average (2.67) nearly
one standard deviation above, whereas all those that had no suicides fall well
below the mean.7 The following multivariate analysis examines these relationships in more detail.
MULTIVARIATE ANALYSIS

Table 2 presents the logistic regression equations predicting the log-odds
of prison suicide. Model 1 includes the control variables as well as the percentage of inmates participating in rehabilitation programs. Prisons that
experienced suicides in 1990 were also significantly more likely to experience at least one in 1995 (.777; p < .01). Indeed, facilities that had suicides in
1990 were nearly three times more likely to also have had a suicide in 1995.
This suggests that prison suicide is not a random occurrence but rather consistently related to features of the prison environment.
As expected, prisons with on-site psychiatric facilities are significantly
more likely to experience a suicide (1.345; p < .01) compared to those without them, reflecting in part the placement of high-risk inmates in the former.
Older facilities also evidence higher log-odds of prison suicide, perhaps
reflecting physical and ecological conditions of lesser quality than newer
prisons. Compared to male-only prisons, the log-odds of suicide are significantly lower in facilities housing both males and females (–1.632; p < .01)
and, to a lesser extent, females only (–1.127; p < .10). Consistent with prior
research, prisons in which inmates are held in single or multiple cells are significantly more likely to have experienced a suicide compared to those in
which inmates reside in dormitory-style housing. Differences by region and
operational authority are not statistically significant once suicide in 1990 is
controlled, suggesting that these differences are reflected in stable variations
in the likelihood of suicide over time (captured by the lagged suicide effect).
Finally, in line with deprivation theory, prisons in which larger percentages

Huey, McNulty / PRISON SUICIDE

503

TABLE 2: Logistic Regressions of the Incidence of Suicide in 1995 on Predictor
Variables

Independent Variables
Suicide in 1990
Psychiatric facility
Facility age
Female prison a
Both male and female
b
Single occupancy
Multiple occupancy
North c
South
West
Federal authority d
Private authority
Percentage participating
Maximum security e
Medium security
Overcrowding
Overcrowding * maximum
Overcrowding * medium
Constant
Pseudo R-square

(1)

(2)

(3)

(4)

(5)

†

.777**
.550
.359
.239
.325
1.345**
.903** 1.074**
.769**
.748**
.009**
.008**
.008**
.007*
.008*
†
†
†
–1.127 –1.209 –1.007 –1.049 –1.070
†
–1.632** –1.492* –1.452* –1.284* –1.259
†
1.213**
.697
1.340**
.873*
.914*
.894**
.717*
.816**
.671*
.777*
–.407
–.477
–.468
–.508
–.475
†
–.345
–.513
–.293
–.441
–.414
–.145
–.077
–.562
–.440
–.303
.515
.469
.452
.481
.378
–1.063
–.652
–.797
–.558
–.362
–.017** –.009
–.012*
–.006
–.004
1.940**
1.613** 1.165**
1.437**
1.067**
.501
.182**
.145**
.954**
–.866**
–.804**
–3.131 –3.893 –3.081 –3.678 –3.216
.263
.303
.305
.329
.350

NOTE: Logit coefficients presented. N of cases = 1,118.
a. Reference is male prisons.
b. Reference is dormitory housing.
c. Reference is Midwest.
d. Reference is state authority.
e. Reference is minimum security.
†
p < .10, *p < .05, **p < .01.

of inmates are participating in rehabilitation, education, and work skills
programs evidence significantly lower log-odds of experiencing a suicide.
Model 2 incorporates the security-level indicators, which have theoretically expected effects. Compared to minimum-security prisons, both
maximum-security (1.940; p < .01) and medium-security (1.437; p < .01) facilities have substantially and significantly higher log-odds of prison suicide. Consistently, the log-odds of suicide are also significantly higher for
maximum- compared to medium-security prisons. Security level is by far the
strongest predictor in the model. Indeed, maximum- and medium-security
prisons are, respectively, about 7.5 and 4.5 times more likely to have experienced a suicide in 1995 than their minimum-security counterparts.
In addition, the security-level measures reduce the effect of suicide in
1990 to borderline significance (.550; p < .10), reflecting that suicide is less

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THE PRISON JOURNAL / December 2005

likely in lower security settings and that deprivation is one feature of prison
environments that is consistently related to the likelihood of suicide. Also
noteworthy is that the effect of inmate program participation on the log-odds
of suicide is no longer statistically significant in Model 2, a function of lower
levels of participation in medium- and maximum-security prisons compared
to minimum-security facilities. Further, the significantly lower log-odds of
suicide observed in Model 1 for prisons with single cell occupancy relative to
those with dormitory-style housing is reduced substantially to borderline
significance (1.213 to .697). This finding is a function of a larger proportion
of prisons with dormitory housing being minimum security, under which
conditions suicides are less likely to occur.
Model 3 alternately incorporates the overcrowding index, which also has
the theoretically expected effect: The log-odds of suicide are significantly
higher in prisons in which there is a greater degree of overcrowding (.182;
p < .01). Whereas the security-level measures reduce the suicide in 1990
coefficient to borderline significance (Model 2), the overcrowding index
fully reduces this effect to zero. This indicates that overcrowding is another
institutional condition that is consistently related to prison suicide, explaining why prisons that had suicides in 1990 were also more likely to experience
suicides in 1995. Note also that the effect of inmate program participation
retains a significant and theoretically expected net effect in reducing the logodds of suicide in Model 3 (–.012; p < .05). In addition, overcrowding does
not account for the contrast between facilities with single cell and dormitory
occupancy, as do the indicators of deprivation (security level) in Model 2.
Thus, the effect of program participation and occupancy design on the logodds of prison suicide appears more a function of differences in deprivation
than variation in levels of overcrowding.
Model 4 in Table 2 presents the fully specified equation, and Model 5
incorporates the product terms between the overcrowding index and the
security-level dummy variables. Other than the reduction in the magnitude
(but not significance) of the maximum, medium, and overcrowding coefficients (a function of considering their net effects), there are no especially
noteworthy changes in the effects of the remaining variables in Model 4.
Consistent with our key hypothesis, however, Model 5 reveals a strong
and significant interaction effect between overcrowding and security level on
suicide in 1995 (chi-square = 12.86; p < .01). The negative coefficients for
the product terms (–.866; –.804) indicate that the differences in the log-odds
of suicide between security levels diminish significantly at higher levels of
overcrowding. This finding suggests that the buffer against suicide provided
by lesser deprivation in minimum-security facilities may be erased under
conditions of high overcrowding.

Huey, McNulty / PRISON SUICIDE

505

TABLE 3: Probe of Interaction Effect Between Overcrowding and Security Level

Security-Levela
Minimum
Medium
Maximum

Overcrowding
Effect By
Security-Level
.954**
.150**
.088†

Security-Level Contrasts By
Levels of Overcrowding
1/2 SD above

-.621
-.045

At Mean

.501
1.165**

1/2 SD below

1.623**
2.374**

NOTE: Logit coefficients presented.
a. The log-odds of suicide are higher in maximum versus medium security prisons, but
the difference does not vary significantly with levels of overcrowding.
†
p < .10, *p < .05, **p < .01.

The main effects of maximum- and medium security indicate the difference in log-odds relative to minimum-security prisons at the mean level of
overcrowding. Thus, the log-odds of suicide are significantly higher in maximum-security facilities (1.165; p < .01), whereas the difference between
medium- and minimum-security prisons is not significant (.501) when evaluated at the mean of overcrowding. The interaction also indicates that the
effect of overcrowding on the log-odds of suicide is significantly more pronounced in minimum-security prisons (.954; p < .01). The corresponding
effect in maximum-security prisons is .088 (.954–.866; p < .10) and in
medium-security prisons is .150 (.954–.804; p < .01).
Table 3 summarizes this variation in the overcrowding index effect across
security levels (shown in the first column). This table also shows the security-level contrasts in the log-odds of suicide at specified levels of overcrowding (shown in columns 2-4). Consistent with our hypothesis, the
higher log-odds of prison suicide in medium-/maximum-security compared
to minimum-security facilities are most pronounced at lower levels of overcrowding (one-half standard deviation below the mean) and hence are primarily indicative of differences in deprivation. At one-half standard deviation above the mean of overcrowding, however, the likelihood of suicide
in medium-/maximum-security prisons is not significantly higher than in
minimum-security facilities.8
These findings indicate that the detrimental effects of high levels of overcrowding override the effects of differences in deprivation, thus nullifying
the reduced risk of suicide in minimum-security prisons. This is consistent
with the variation in the overcrowding effect, which is most pronounced in
minimum-security and least pronounced in maximum-security facilities. To
further illustrate this point and the pivotal effect of overcrowding, Figure 3
displays mean predicted probabilities of suicide (based on Model 5 in Table

506

THE PRISON JOURNAL / December 2005

5.00

Predicted Probability by Overcrowding

4.00

4.41

4.16

3.00

2.00

2.18

1.00
.28
0.00

.01 .02
-.86

.40

.21
.04

.18

-1.00
-1.61

-1.69

one-half SD + below
-1.90

-2.00

within one-half SD

-3.00

one-half SD + above
minimum

medium

maximum

FIGURE 3: Predicted Probabilities of Suicide by Security Level and
Overcrowding

2) by security level and the levels of overcrowding shown in Table 3. The horizontal line represents the mean predicted probability for the total sample
(.10). Below this line, the top number in each bar is the mean predicted probability and the bottom number the mean on the overcrowding index; above
the line, the mean predicted probability is the bottom number.
Figure 3 reveals that the probability of suicide increases dramatically as
overcrowding increases and that this is particularly marked for minimumsecurity prisons. Indeed, the mean predicted probability (.28) of suicide is
96% higher in minimum-security prisons with values one-half or more standard deviation units above the overcrowding mean compared to their counterparts at the other extreme (.01). For medium- and maximum-security prisons, the predicted probability is 81% and 55% higher, respectively, in those
with high compared to low overcrowding. Further, among prisons with
low overcrowding, the predicted probabilities of suicide in medium- and
maximum-security facilities are, respectively, 75% and 94% higher than in
their minimum-security counterparts. Among those with high overcrowding,
however, the predicted probabilities in medium- and maximum-security

Huey, McNulty / PRISON SUICIDE

507

facilities are only 25% and 30% higher than in minimum-security prisons.
These results provide strong evidence for the key role played by overcrowding in prison suicide.
DISCUSSION
The emphasis in prior prison suicide research on an individual level of
explanation has obscured attention to the institutional contexts in which
inmates are held (Lester & Danto, 1993; Liebling, 1995, 1999). The purpose
of this article has been to provide some balance in the literature by examining
the effect of prison characteristics on the incidence of suicide using national
data on U.S. prisons. Specifically, the analysis focused on the effects of
deprivation, overcrowding, and the interaction between these factors on
prison suicide. In addition to the focus on individuals, prior research has not
considered whether deprivation and overcrowding processes are mutually
dependent in their effects. Our central argument is that overcrowding is a pivotal factor that conditions the effects of deprivation on prison suicide.
Findings corroborate the predictions of deprivation and overcrowding
theories but also indicate, consistent with our central argument, that overcrowding is a critical feature of prison environments that dramatically raises
the risk of prison suicide. Our analysis reveals that the greater likelihood of
suicide in medium-/maximum-security compared to minimum-security
facilities is evident only at lower levels of overcrowding and hence indicative
of differences in deprivation. Yet, at high levels of overcrowding, minimumsecurity prisons are as likely to experience a suicide as their higher security
counterparts. These findings indicate that the reduced risk of suicide found in
much prior research to be evident in minimum-security facilities is in fact
voided by the deleterious effects of high overcrowding.
Theoretically, our results point to two primary implications. First, overcrowding is an institutional condition that clearly must be considered in conjunction with the effects of deprivation (and perhaps other prison characteristics that we were unable to examine here). Whereas prior theory and research
have examined these conditions as separate issues, our findings suggest that
what is needed is integration of deprivation and overcrowding perspectives
into a unified theoretical framework. This article has taken an initial and
modest step in this direction.
Second, and perhaps more important, our results suggest that research
focused on an individual level of explanation that does not take into account
the larger institutional context may be subject to specification error (and vice
versa). Further research could evaluate this possibility and provide a more

508

THE PRISON JOURNAL / December 2005

stringent test of our arguments by simultaneously considering the effects
of inmate and prison characteristics. This would allow for assessment of
how individual-level characteristics (e.g., inmate mental health) might interact with or mediate the effects of the institutional conditions of prison
environments.
For example, a reasonable hypothesis is that inmates with preexisting
mental health issues may be especially affected by conditions such as overcrowding, perhaps accounting in part for their heightened risk of suicide documented in much prior research. Thus, in addition to integration of deprivation and overcrowding theories, integration of individual and institutional
levels of analysis would likely contribute to substantial theoretical advances
in the literature on prison suicide. Unfortunately, to our knowledge, data sets
that link individual inmate and prison-level records are not readily available
(at least at a national level).
From a policy perspective, reducing prison overcrowding should be a priority. Our analysis indicates that overcrowding is a strong predictor of
heightened suicide and may threaten security and safety within prisons more
generally by undermining the well-being of inmates. We do not suggest
building more prisons; nor should suicide prediction and prevention strategies acclimatize to overcrowding. Rather, we offer a couple of potential alternatives. First, criminal justice policy, in contrast to the traditional “reactive”
approach to crime, should focus more intently on the underlying causes of
criminal behavior. These include (but are not limited to) family, community,
school, and peer processes that have been shown in criminological research
to relate to involvement in crime. Addressing these underlying causes
through meaningful and proactive social policy would reduce the flow of
people into the criminal justice system in the first place.
Second, our results suggest that increasing the provision and participation
of inmates in rehabilitation, education, and work skills training programs
would help prevent suicide. Participation in such programs would foster a
more tolerable prison atmosphere (for correctional staff as well) by reducing
idleness and frustration and would provide inmates with relevant skills as
well as a sense of meaning and possibility. This might also contribute to
reductions in overcrowding by better preparing inmates for successful reintegration and earlier releases into society. Programs within prisons, however,
need to be connected to community-based services on the outside that can
provide ex-inmates with job placement and educational opportunities upon
release. Unfortunately, fiscal constraints, in part related to overcrowding,
have led to the dismantling of rehabilitation and other programs in many prisons. Yet, as Kupers (1999) forcefully argues, that suicide accounts for more

Huey, McNulty / PRISON SUICIDE

509

than half of all deaths in custody ought to sound an alarm to policy makers
about the inadequacies of the services provided to prisoners.

APPENDIX 1:
Distribution of Prisons by Overcrowding and Security Level
Levels of Overcrowding
Security Level

1/2 SD +
Below Mean

Within 1/2 SD
of Mean

1/2 SD +
Above Mean

Total

Minimum
Medium
Maximum

344
55
12

179
203
125

10
117
73

533
375
210

Total

411

507

200

1,118

APPENDIX 2:
Correlations Between Variables
Variables

1

1 Suicide 1995
1.00
2 Suicide 1990
.26
3 Psychiatric facility .28
4 Facility age
.13
5 Female prison –.06
6 Both male and
female
–.07
7 Single
occupancy
.16
8 Multiple
occupancy
.05
9 North
.01
10 South
–.07
11 West
–.01
12 Federal authority .05
13 Private authority –.06
14 Percent
participating –.16
15 Maximum
security
.28
16 Medium security .05
17 Overcrowding
.35

2

3

4

5

6

7

8

9

10

1.00
.30 1.00
.11 .09 1.00
–.07 –.01 .07 1.00
–.01 –.02 –.02 –.09 1.00
.17
.08
.01
–.09
.07
.06
–.07

.15

.02 –.05 1.00

.07 .01 .08
.14 –.38 1.00
.03 .21 –.01 –.05 .09 –.02 1.00
–.01 –.15 –.03 –.13 –.15 –.11 –.39 1.00
–.02 –.08 .07
.14 –.01 .05 –.21 –.44
–.04 –.01 –.05
.01 –.03 .10 –.02 .03
–.08 .03 .09
.07 .04 .05 –.10 –.01

–.18 –.08
.28
.05
.40

.03

.09

.13

.03 –.08

.32 .07 –.02 –.08
.11 –.08 –.02
.01
.33 .07 –.09 –.06

.05

.13 –.01

.34 –.02 –.01 .05
.01 –.03 .09 –.04
.07 .09 .03 –.11

(continued)

510

THE PRISON JOURNAL / December 2005

APPENDIX 2 (continued)
Variables
1 Suicide 1995
2 Suicide 1990
3 Psychiatric facility
4 Facility age
5 Female prison
6 Both male and female
7 Single occupancy
8 Multiple occupancy
9 North
10 South
11 West
12 Federal authority
13 Private authority
14 Percent participating
15 Maximum security
16 Medium security
17 Overcrowding

11

12

13

1.00
.00
.22
–.04
.09
–.02
.09

1.00
–.05
–.09
–.06
.12
.10

1.00
.16
–.09
–.07
–.10

14

15

16

17

1.00
–.29 1.00
–.12 –.34 1.00
–.27
.24 .26 1.00

NOTES
1. The psychological make-up, mental illness, and psychiatric impairment of prison suicide
victims is well documented in the literature (see Axelson & Wahl, 1992; Bland, Newman, Dyck,
& Orn, 1990; Bonner & Rich, 1992; Dooley, 1990; Fogel, 1992; Green et al., 1993; Hurley, 1989;
Ivanoff, 1992; Ivanoff & Jang, 1991; Maden, Swinton, & Gunn, 1994; Marcus & Alcabes, 1993;
Skegg & Cox, 1991; Smyth & Ivanoff, 1994; Tatarelli et al., 1999).
2. Data on prison facilities linked with data on the individual inmates in them would provide a
more thorough empirical test of our arguments. Unfortunately, to our knowledge, such data are
currently not available on a national level.
3. See, for example, Ruiz v. Estelle (1980), Holt v. Sarver (1970), Pugh v. Locke (1976), Hutto
v. Finney (1978), Rhodes v. Chapman (1982), and Toussaint v. Rushen (1983).
4. Preliminary analysis did not reveal a significant interaction between overcrowding and our
other indicator of deprivation, the percentage of inmates participating in rehabilitative and other
programs.
5. We use one-half (rather than full) standard deviation units to ensure a sufficient number of
minimum-, medium-, and maximum-security prisons at each level of overcrowding. In particular, the number of minimum- and maximum-security prisons beyond a full standard deviation
unit above (2 minimum) and below (2 maximum) the overcrowding mean is relatively small.
Nevertheless, our reported results are fully replicated using full standard deviation units to probe
the interaction (available on request).
6. In preliminary analysis, we also controlled for several additional measures that might
relate to the differential risk of experiencing a suicide across prisons, including whether they
have on-site medical facilities and other forms of prison violence such as homicides. None of
these controls, however, reached statistical significance or affected the pattern of results reported
in our models.

Huey, McNulty / PRISON SUICIDE

511

7. Note that the overcrowding index effectively controls for the differential risk of experiencing a suicide associated with numbers of inmates.
8. Although the log-odds of prison suicide are higher in maximum-security relative to
medium-security prisons, the difference does not vary significantly with levels of overcrowding,
suggesting that it is principally due to differences in deprivation.

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Meredith P. Huey is a Ph.D. candidate in sociology at the University of Georgia. She
received her M.A. in sociology from the University of North Carolina, Greensboro. She
currently works as a researcher at the Center for Research on Behavioral Health and
Human Services Delivery at the University of Georgia. Her research interests include the
social control of crime and the medicalization of deviance.

514

THE PRISON JOURNAL / December 2005
Thomas L. McNulty received his Ph.D. in 1996 at the University at Albany–SUNY. He is
currently an associate professor of sociology at the University of Georgia. His current
research focuses on the role played by community and spatial contexts in explanation of
racial/ethnic differences in violence, the relationship between gangs, drugs, and violence, and labor market effects on delinquency.

 

 

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