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Table 4 Duration in months to the first documentation of mental illness made after prison entrya

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

Mental disorders First diagnosisb
n = 4044
Months Percent diagnosed in months
Frequency (%) Mean (SD) Median [range] ≤1 >1–6 > 6–24 > 24
Substance abusec 1130 (27.9) 10.3 (36.6) 0.5 [0.25–402] 72.2 13.5 6.0 8.3
Depression 729 (18.0) 26.2 (65.0) 0.75 [0.25–483] 57.2 14.9 8.0 19.9
Anxiety 616 (15.2) 24.4 (57.6) 1.0 [0.25–385] 52.1 18.3 12.0 17.5
Personality disorders 366 (9.1) 29.5 (59.0) 3.0 [0.25–354] 39.1 21.3 13.9 25.7
Psychosis and psychotic disorders 280 (6.9) 13.7 (36.3) 0.75 [0.25–290] 60.7 16.4 10.0 12.9
Developmental disabilities 250 (6.2) 15.5 (39.4) 2.0 [0.25–268] 42.4 28.4 15.6 13.6
Post-traumatic stress disorders 247 (6.1) 21.0 (49.7) 1.0 [0.25–322] 53.0 19.8 7.3 19.8
Bipolar 175 (4.3) 11.4 (24.1) 1.0 [0.25–143] 52.0 17.7 18.3 12.0
Schizophrenia 91 (2.3) 52.2 (90.2 5.0 [0.25–354] 44.0 6.6 11.0 38.5
Dysthymia/neurotic depression 66 (1.6) 44.7 (57.7) 18.0 [0.25–216] 31.8 12.1 10.6 45.5
Impulse control 55 (1.4) 18.6 (26.7) 5.0 [0.25–100] 36.4 16.4 23.6 23.6
Dementia 18 (0.5) 6.7 (8.1)) 3.5 [0.25–30] 33.3 33.3 27.8 5.6
Sexual disorders, paraphilia 9 (0.2) 23.9 (51.2) 1.0 [0.25–158] 55.6 0 22.2 22.2
Sleep, movement and eating disorders 9 (0.2) 41.1 (53.1) 4.0 [0.25–144] 33.3 22.2 0 44.4
Pervasive developmental disorders 3 (0.1) 0.4 (0.3) 0.25 [0.25–0.75] 100.0 0 0 0
  1. SD standard deviation
  2. aexcluding any prisoners with mental illness diagnosed before incarceration
  3. bThe first documentation of mental illness included 1 to 5 different types of mental disorders; the denominator for the total frequency may include multiple mental disorders per prisoner
  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