Table 1. Characteristics of 500 first-episode DSM-IV psychotic disorder patients.
| Characteristic | Value |
|---|---|
| Subjects N [%]) | |
| All cases | 500 (100%) |
| Men | 275 (55.0%) |
| Women | 225 (45.0%) |
| Age at onset (years) | 31.7 ± 13.7 |
| Comorbidties | |
| Substance use disorders | 256 (51.2%) |
| Axis II personality disorders | 111 (22.2%) |
| Anxiety disorders | 88 (17.6%) |
| Prevalence of initial DSM-IV diagnoses (%, by rank) | |
| Any Bipolar I | 231 (46,2%) |
| Bipolar I (initially manic) | 148 (29.6%) |
| Bipolar I (initially mixed) | 83 (16.6%) |
| Major Depressive Disorder | 77 (15.4%) |
| Psychosis NOS | 66 (13.2%) |
| Schizophrenia | 48 (9.6%) |
| Brief Psychotic Disorder | 36 (7.2%) |
| Delusional Disorder | 22 (4.4%) |
| Schizophreniform Disorder | 19 (3.8%) |
| Schizoaffective Disorder | 1 (0.2%) |
| Changed initial diagnoses (%, by rank) | |
| Schizophreniform Disorder | 17/19 (89.5%) |
| Psychosis NOS | 32/66 (48.5%) |
| Major Depressive Disorder | 23/77 (42.9%) |
| Brief Psychotic Disorders | 14/36 (38.9%) |
| Delusional Disorder | 6/22 (27.3%) |
| Schizophrenia | 12/48 (25.0%) |
| Bipolar I (initially mixed) | 7/83 (8.4%) |
| Bipolar I (initially manic) | 1/148 (0.7%) |
| Any Bipolar I Disorder | 8/231 (3.5%) |
| Schizoaffective Disorder | 0/1 (0.0%) |
NOS = not otherwise specified.
Diagnoses are based on initial SCID assessments.
Overall diagnostic stability averaged 74.0% (370/500).