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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