Table 1.
Demographic and cognitive characteristics of the sample included in the analysis
| Controls N=1308 | FEP N=828 | Df | Test Statistics | P value | |
|---|---|---|---|---|---|
| Age (mean; sd) | 36.2 (13) | 30.9 (10.6) | 2134 | t = 9.9 | <.001 |
| Sex (male %; N) | 47.4 (620) | 61.8 (512) | 1 | χ 2 = 42.4 | <.001 |
| Ethnicity (%; N) | |||||
| White | 77.4 (1012) | 64.4 (533) | 5 | χ 2 = 49.3 | <.001 |
| Black | 8.4 (110) | 14.9 (123) | |||
| Mixed | 8.6 (112) | 11.5 (95) | |||
| Asian | 2.3 (30) | 2.9 (24) | |||
| North African | 1.7 (22) | 4.2 (35) | |||
| Other | 1.7 (22) | 2.2 (18) | |||
| IQ (mean; SD) | 102.7 (17.7) | 85.6 (18.1) | 2041 | t = 20.9 | <.001 |
IQ, intelligence quotient.