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Table 2 History of mental illness in younger and older prisoners (n = 8574)

From: Inside the nation’s largest mental health institution: a prevalence study in a state prison system

Mental disorders from the ICD9 and DSM Younger
n = 7107
Older
n = 1467
All
n = 8574
OR (95% CI)a
Reference = older
Mental illness (DSM and ICD9) 3448 (48.5) 645 (44.0) 4093 (47.7) 1.3 (1.2–1.5)
 Mental illness (DSM) 3222 (45.3) 570 (38.9) 3792 (44.2) 1.4 (1.3–1.6)
 Mental illness (ICD9 only) 226 (3.2) 75 (5.1) 301 (3.5) 0.7 (0.5–0.9)
Serious mental illnessb (DSM and ICD9) 2048 (28.8) 404 (27.5) 2452 (28.6) 1.1 (0.99–1.3)
 Serious mental illness (DSM) 1976 (27.8) 386 (26.3) 2362 (27.5) 1.1 (1.0–1.3)
 Serious mental illness (ICD9 only) 72 (1.0) 18 (1.2) 90 (1.0) ne
Substance usec (DSM and ICD9) 1928 (27.1) 312 (21.3) 2240 (26.1) 1.5 (1.3–1.7)
 Substance use (DSM) 1791 (25.2) 286 (19.5) 2077 (24.2) 1.5 (1.3–1.7)
 Substance use (ICD9 only) 137(1.9) 26 (1.8) 163 (1.9) 1.2 (0.8–1.8)
Depression, major depressive disorders 1267 (17.8) 294 (20.0) 1561 (18.2) 0.9 (0.8–1.1)
Anxiety, general anxiety, panic disorders 1222 (17.2) 193 (13.2) 1415 (16.5) 1.5 (1.3–1.8)
Personality disorders 824 (11.6) 135 (9.2) 959 (11.2) 1.3 (1.1–1.6)
Psychosis, psychotic disorders 664 (9.3) 97 (6.6) 761 (8.9) 1.5 (1.2–1.9)
Developmental disabilities 677 (9.5) 45 (3.1) 722 (8.4) 3.5 (2.6–4.8)
Bipolar 579 (8.2) 65 (4.4) 644 (7.5) 2.1 (1.6–2.7)
Post-Traumatic Stress Disorder 459 (6.5) 79 (5.4) 538 (6.3) 1.2 (0.9–1.5)
Schizophrenia 177 (2.5) 77 (5.3) 254 (3.0) 0.5 (0.4–0.6)
Impulse control disorders 160 (2.3) 10 (0.7) 170 (2.0) 3.6 (1.9–6.9)
Dysthymia, neurotic depression 132 (1.9) 45 (3.1) 177 (2.1) ne
Dementia 29 (0.4) 24 (1.6) 53 (0.6) ne
Sleep, movement and eating disorders 24 (0.3) 2 (0.1) 26 (0.3) ne
Sexual disorders, paraphelias 11 (0.2) 3 (0.2) 14 (0.2) ne
Pervasive developmental disorders 7 (0.1) 0 (0.0) 7 (0.1) ne
Somatization disorders 0 (0.0) 1 (0.1) 1 (0.0) ne
  1. DSM The Diagnostic and Statistical Manual of Mental Disorders, ICD9 The International Classification of Diseases, 9th Revision, ne not estimable, sample size too small. CI confidence interval
  2. aOdds Ratios and 95% CI are from logistic regression models adjusting for sex and race/ethnicity. If the (95% CI) includes 1.0, the odds ratio is not statistically significant
  3. bSerious mental illness includes bipolar disorders, dementia/organic disorders, depression and major depressive disorders, dysthymia/neurotic depression, psychosis/psychotic disorders, schizophrenia, and substance use disorders
  4. cSubstance use includes alcohol-induced persisting amnestic disorder, cannabis-induced psychotic disorder, with hallucinations, other (or unknown) substance-induced psychotic disorder with hallucinations, phencyclidine-induced psychotic disorder, with hallucinations, psychotic disorder NOS, substance-induced, alcohol dependence, opioid dependence, sedative/hypnotic/anxiolytic dependence, cocaine dependence, cannabis dependence, amphetamine dependence, other polysubstance abuse, methamphetamine dependence, hallucinogen dependence, inhalant dependence, polysubstance dependence, other (or unknown) dependence, phencyclidine dependence