Table 1.
Demographic Variables and Cannabis Use Across All Included FEP Cases and Controls
| Variables | Controls (n = 1497) | FEP cases (n = 1130) | χ² P value |
|---|---|---|---|
| Age, years (mean, SD) | 36.06 (12.90) | 31.25 (10.61) | <.001 |
| Sex, n (%) | <.001 | ||
| Female | 791 (52.8%) | 433 (38.3%) | |
| Male | 706 (47.2%) | 697 (61.7%) | |
| Self-reported ethnicity, n (%) | <.001 | ||
| Asian | 33 (2.2%) | 35 (3.1%) | |
| Black | 121 (8.1%) | 183 (16.2%) | |
| Mixed | 116 (7.7%) | 110 (9.7%) | |
| North African | 24 (1.6%) | 52 (4.6%) | |
| White | 1178 (78.7%) | 715 (63.3%) | |
| Other | 24 (1.6%) | 35 (3.1%) | |
| Missing data | 1 (0.1%) | 0 (0%) | |
| Education, n (%) | <.001 | ||
| School, no qualifications | 72 (4.8%) | 185 (16.4%) | |
| School, with qualifications | 197 (13.2%) | 291 (25.7%) | |
| Tertiary | 431 (28.8%) | 260 (23%) | |
| Vocational | 238 (15.9%) | 198 (17.5%) | |
| Higher (undergraduate) | 343 (22.9%) | 128 (11.3%) | |
| Higher (postgraduate) | 209 (13.7%) | 56 (5%) | |
| Missing data | 7 (0.5%) | 12 (1.1%) | |
| Cannabis use, n (%) | |||
| Current | 160 (10.7%) | 242 (21.4%) | <.001 |
| Lifetime | 703 (46.9%) | 702 (62.1%) | <.001 |
| Country, n (%) | |||
| United Kingdom | 336 (22.4) | 246 (21.8) | .015 |
| The Netherlands | 210 (14.0) | 196 (17.3) | |
| Italy | 280 (18.7) | 187 (16.5) | |
| France | 147 (9.8) | 105 (9.3) | |
| Spain | 222 (14.8) | 204 (18.1) | |
| Brazil | 302 (20.2) | 192 (17.0) | |
Note: FEP, first-episode psychosis; SD, standard deviation.