Table 2.
Demographic characteristics of all participants in GROUP study and those included in the pilot study.
| Variable | All participants in GROUP study |
Participants in the pilot study |
||
|---|---|---|---|---|
| Psychosis (n = 1120) | Controls (n = 1648) | Cases (n = 9) | Controls (n = 5) | |
| Male (%) | 76 | 45.7 | 100.0 | 20.0 |
| Age, mean (SD) | 27.7 (8.1) | 28.7 (9.3) | 25.2 (1.9) | 28.0 (8.4) |
| IQ, mean (SD) | 94.9 (16.1) | 105.4 (15.6) | 100.2 (11.0) | 114.0 (19.2) |
| Illness Duration, years, mean (SD) | 4.4 (4.1) | – | 3.8 (2.5) | – |
| DSM-IV diagnosis (%) | ||||
| • Schizophrenia | 68.8 | – | 44.4 | – |
| • Schizoaffective | 10.7 | – | 44.4 | – |
| • Psychosis not otherwise specified | 10.4 | – | 11.1 | – |
| • Other | 10.1 | – | – | – |
| PANSS score, mean (SD) | ||||
| Positive | 13.9 (6.6) | – | 11.1 (5.6) | – |
| Negative | 15.0 (6.7) | – | 16.8 (4.7) | – |
| Psychotic episodes, mean (SD) | 1.7 (1.1) | – | 1.7 (0.7) | – |
IQ, intelligence quotient; PANSS, positive and negative syndrome scale; SD, standard deviation.