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Dr. Gunter is Assistant Professor, Dr. Arndt is Professor, Ms. Wenman is Research Assistant, Drs. Loveless and Allen are statistical consultants, Dr. Sieleni is Adjunct Clinical Associate Professor, and Dr. Black is Professor, Department of Psychiatry, University of Iowa, Roy J. and Lucille A. Carver College of Medicine, Iowa City, IA. Dr. Arndt is Director, The Iowa Consortium for Substance Abuse Research and Evaluation, Iowa City, IA. Dr. Sieleni is also Director of Mental Health Services, Department of Corrections, Iowa Medical and Classification Center, Oakdale, IA. Address correspondence to Donald W. Black, MD, University of Iowa Carver College of Medicine, Psychiatry Research, 2-126b MEB, Iowa City, IA 52242. E-mail: donald-black{at}uiowa.edu
| Abstract |
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The rate of severe mental disorders has been estimated at 20 percent, with up to 75 percent having co-occurring substance misuse.4 Based on a review of pertinent studies, Metzner5 estimated that from 8 to 19 percent of incarcerated offenders in the United States have a psychiatric disorder that results in functional disability, and another 15 to 20 percent will need some form of psychiatric intervention. In addition, rates of substance misuse in offenders are even higher.6 Along with a growing census, the composition of the prison population is changing, as women and minorities are entering these systems at rates higher than men or Caucasians.7–11 The prison population is also aging, creating additional problems relating to the medical needs of elderly offenders.6 For these reasons, increasing attention is now being focused on the medical and psychiatric needs of the incarcerated.12 Class action lawsuits initiated by offenders and advocacy groups have forced many states to expand mental health services and to improve general conditions.5 Yet, despite legal mandates and public pressure to improve screening for mental and addictive disorders in prisons, its effectiveness has been questioned, and the prevalence of these conditions has probably been underestimated.
The current study was developed to provide information about the prevalence of current and lifetime mental and addictive disorders in offenders newly committed to the Iowa Department of Corrections (IDOC), by using the Mini International Neuropsychiatric Interview-Plus (MINI-Plus). This study follows on the heels of a pilot project in which the MINI was used as a screening tool in 67 offenders.13 (The MINI is a brief version of the MINI-Plus.) Based on our own expectations and the literature, we hypothesized that women would have higher rates of internalizing disorders (such as mood and anxiety disorders), whereas men would have higher rates of externalizing disorders, including addictions and antisocial personality disorder (ASPD). To our knowledge, this is the first study in which the MINI-Plus has been used to assess a corrections-based sample.
| Methods |
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Subjects were randomly selected from the list of incoming nonviolent offenders newly committed to the Iowa Medical and Classification Center (IMCC), located in Oakdale, Iowa. The sample did not include violent offenders, those requiring special programming (e.g., close supervision, segregation, or seclusion), or those requiring maximum security. Violent offenders and those requiring segregation or maximum security placement were excluded because they could not be easily moved into the testing area. Stays in special programming units were generally brief, so that most inmates were unavailable for testing. Women were purposely overrepresented in the sample, so that their percentage in the study was approximately twice that in the Iowa prison population. The IMCC serves as a reception facility for the IDOC, wherein all new offenders are admitted for intake and reception activities, including health screening, basic orientation to Iowa's correctional system, risk assessment, and institutional assignment. The process lasts from four to six weeks, after which offenders are assigned to one of nine correctional facilities throughout Iowa to serve their sentences. All subjects gave written, informed consent according to procedures approved by both the Institutional Review Board of the University of Iowa and the IDOC. They were told that the study data would be confidential and protected by a Federal Certificate of Confidentiality. All subjects received compensation. Researchers were not employed by the IDOC and did not participate in any offender's care while at IMCC. Urgent or emergent issues were referred to the IMCC staff as deemed necessary.
Assessment
Demographic and criminal history information were collected on each offender. The MINI-Plus was then administered by trained interviewers.14 This instrument allows for the coding of more than 60 variables, including DSM-IV15 disorders and suicide risk at the time of the interview or at some time in the past. The MINI has been directly compared with the Structured Clinical Interview for DSM-III-R (SCID),16 and MINI diagnoses were characterized by good or very good kappa values, with only a single value (current drug dependence) under 0.50. Sensitivity was 0.70 for all disorders except dysthymia, obsessive-compulsive disorder (OCD), and current drug dependence. Positive predictive values were above 0.75 for major depression, lifetime mania, current and lifetime panic disorder, lifetime agoraphobia, lifetime psychotic disorder, anorexia, and post-traumatic stress disorder (PTSD). Otsubo et al.17 compared Japanese versions of both the MINI and SCID; they reported that the kappa values showed good or excellent agreement between the MINI and SCID diagnoses.
The MINI-Plus employs different time frames for various disorders: current, past, or lifetime. These time frames have been collapsed for this report: lifetime disorders include major depressive disorder, dysthymia, mania/hypomania, panic disorder, agoraphobia, alcohol and other drug use disorders, psychotic disorders, somatization disorder, hypochondriasis, ASPD, and attention deficit hyperactivity disorder (ADHD); current disorders include major depression, dysthymia, mania/hypomania, panic disorder, agoraphobia, generalized anxiety disorder, social phobia, specific phobia, OCD, PTSD, alcohol and other drug use disorders, psychotic disorders, anorexia nervosa, bulimia nervosa, somatoform disorders, ADHD, and adjustment disorders. The instrument assesses suicide risk by combining several relevant items (current or past suicidal thoughts, plans, and attempts), yielding a score that ranges from 0 to 33. Low risk is indicated by a score of 1 to 5; moderate risk, 6 to 9; and high risk,
10.
Statistical Analysis
Men and women were compared on demographic variables. For the categorical variables (race/ethnicity, education, marital status, type of current offense, and current suicide risk), we used Pearson's chi-square test (or Fisher's exact test when the expected cell counts were too small). For all analyses, p < .05 was considered statistically significant. By fitting multiple logistic regression models with gender, age, race/ethnicity, and ASPD, we obtained adjusted odds ratios for gender and each MINI-plus disorder, treating men as the reference group (hence, an odds ratio greater than 1.0 implies that women were more likely to have the disorder). We felt that it was important to adjust the gender/disorder relationships for age because the prevalence of many disorders varies by age and race/ethnicity, since the men in our sample were disproportionately Caucasian, and ASPD, because ASPD is more common in men and also co-occurs frequently with other disorders. Because of low expected cell counts, multiple logistic regression could not be used for all MINI-plus disorders. Instead, Fisher's exact test was used to test for association of gender and each disorder.
| Results |
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| Discussion |
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The study confirms the high frequency of mental and addictive disorders in incarcerated offenders, findings generally consistent with reports from other prison-based studies.18–29 In fact, more than 90 percent of offenders met criteria for at least one lifetime MINI-Plus disorder. Compared with community rates, substance use and psychotic, mood, and anxiety disorders were all more frequent, as were ASPD and ADHD.30–32 The high frequency of mental disorders and substance misuse is independent of race, gender, type of offense, and age. Nonetheless, our expectations regarding the distribution of disorders were not confirmed, because with few exceptions prevalence rates of most disorders were similar in men and women.
Of importance, the study shows that current disorders are common among persons newly committed to Iowa's prisons. The distinction between current and lifetime disorders has generally been ignored or omitted in prior prevalence studies. While it is necessary to understand lifetime rates, data for current disorders are more important in terms of planning because these are conditions that may require urgent attention. In particular, women had higher rates of PTSD, eating disorder, and adjustment disorders. The presence of these disorders suggests that women may need special programs to address their needs. For example, women may have more difficulty adjusting to their conviction and incarceration than men and may benefit from counseling that addresses this transition.
Unlike prior studies, we also used the MINI-Plus to assess suicide risk. While the validity of this scale has not been adequately studied, a recent report from Brazil showed its utility in a general hospital setting in which 23 percent of their sample of 253 patients was judged to be at risk of suicide.33 Further work is necessary to show whether the scale has sensitivity and specificity sufficient to justify its use with offenders.
The finding that 35 percent of the offenders screened positive for a lifetime psychotic disorder merits discussion. Taken at face value the percentage appears much too high, yet when placed into context, it seems less so. First, most psychoses were substance-related (27%); the remainder (8%) were classified as schizophrenia or psychotic disorder not otherwise specified (NOS), a percentage not out of line with that reported for functional psychoses in correctional samples.25–28 Because psychotic features are commonly observed in substance abusers (particularly when stimulants such as methamphetamine are involved), a high rate of substance-related psychoses is not surprising.34,35 Another possible explanation of these high prevalence figures is that the MINI-Plus overdiagnoses psychotic disorders. Sheehan et al.14 and Otsubo et al.17 each reported a relatively high rate of false-positive diagnoses of psychotic disorders with the MINI. Nor has the MINI-Plus been standardized in the setting of criminal prosecution and incarceration, unusual experiences that could contribute to elevations in instruments designed to measure strange experiences.
The rate of ASPD is higher (35%) than in our pilot study (19%), despite the use of the same diagnostic instrument at the same facility, but the finding could be due to the larger sample and more consistent administration of the MINI-Plus. Of note, there was no significant difference in its prevalence between the men (37%) and the women (27%). While ASPD mainly occurred in the men in the general population, it appeared that its frequency among the incarcerated women approaches that in the men.36 A review of the literature shows that rates of ASPD among incarcerated persons have varied from 11 to 78 percent in men and 12 to 65 percent in women, depending on the sample size, particular prison population sampled, and assessment method used.18,37,38 Unfortunately, high rates of ASPD have not led to significant efforts to provide innovative treatment programs, although models have been developed that address criminal thinking patterns through cognitive-behavioral methods.39
The rate of lifetime ADHD (22%) should also raise concerns. The disorder has gained increasing attention, as it has become clear that it is common and widespread in the general population,32 yet few prison-based studies have been conducted to investigate this concern. Rasmussen et al.40 found a 30 percent prevalence of ADHD among 82 men incarcerated in Norway, and in our pilot study we reported a lifetime prevalence of 10 percent.13 The fact that the disorder responds well to medication should lead to discussions regarding the merits of providing treatment in correctional settings.
There are several limitations to this study. First, because the sample consisted of offenders newly committed to the general population of a reception unit at a state prison, the results may not generalize to incarcerated offenders as a whole or to probationers or parolees. Repeat offenders, those in special programming, maximum-security new offenders, and offenders not sentenced to prison (i.e., probationers) were not included. Second, the study was relatively small, and the power may be insufficient to detect significant differences between the men and women. Third, because the study was exploratory, we chose not to correct for the number of comparisons made. Fourth, because the subjects were predominantly Caucasian from a rural state with a relatively high literacy rate and low crime rate, the findings may not generalize to prison inmates in other states or to minority offenders. Fifth, data for this study are limited to the self-report of the offender and available public information from the IDOC. The diagnoses are based on the MINI-Plus, and no medical records or laboratory data were available. Finally, while it appeared that subjects were forthright in self-reporting symptoms of mental illness, substance misuse, and ASPD, some degree of underreporting of antisocial behaviors and over-reporting of symptoms of mental illness is possible.
In conclusion, the findings should raise concerns about the adequacy of current screening programs for mental and addictive disorders in state prisons and the response of correctional personnel in providing adequate treatment services. Both screening and treatment are legally mandated yet inconsistently implemented throughout the 50 states. Because of the large burden created by mental and addictive disorders, it is urgent that correctional facilities face the growing challenges of providing treatment services to incarcerated offenders. While the MINI-Plus proved to be useful in this study, its length, complexity, and requirement for interviewer training suggest that it is not appropriate as a screening tool in prisons. Its developers have devised a quick screener for use in primary care estimated to take 5 minutes to administer that should be studied for its utility in the correctional system.14
| Acknowledgments |
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This article has been cited by other articles:
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C. J. Easton, S. Devine, M. Scott, and P. Wupperman Commentary: Implications for Assessment and Treatment of Addictive and Mentally Disordered Offenders Entering Prisons J Am Acad Psychiatry Law, March 1, 2008; 36(1): 35 - 37. [Abstract] [Full Text] [PDF] |
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