Characteristics of 1 109 475 men included in analyses
| IQ score | ||||
| 1 or 2 | 3 or 4 | 5 or 6 | 7, 8 or 9 | |
| n | 104 448 | 275 006 | 443 512 | 286 509 |
| Mean (SD) | ||||
| Age (years) | 18.3 (0.6) | 18.2 (0.6) | 18.3 (0.6) | 18.4 (0.6) |
| Height (cm) | 177.3 (6.7) | 178.4 (6.5) | 179.4 (6.4) | 180.4 (6.4) |
| BMI (kg/m2) | 21.9 (3.4) | 21.8 (3.0) | 21.6 (2.7) | 21.4 (2.5) |
| Systolic blood pressure (mm Hg) | 128.5 (11.0) | 128.4 (10.8) | 128.5 (10.8) | 128.6 (10.9) |
| n (%) | ||||
| Parents in non-manual occupation | 20 816 (19.9) | 81 949 (29.8) | 196 478 (44.3) | 176 538 (61.6) |
| Subject in non-manual occupation | 7814 (7.5) | 42 403 (15.4) | 116 188 (26.2) | 118 296 (41.3) |
| University educated | 3561 (3.4) | 31 603 (11.5) | 145 599 (32.8) | 192 593 (67.2) |
| Hospital admission for any unintentional injury | 24 242 (23.2) | 57 206 (20.8) | 76 973 (17.4) | 39 712 (13.9) |