Social risk factors for poor school performance
| Risk factor |
No (%) cases (n = 34) |
No(%) controls (n = 80) |
Odds ratio (95% CI) |
| Unmarried mother | 7 (20.6) | 14 (17.5) | 1.22 (0.4 to 3.4) |
| Maternal smoking4-150 | 15 (44.1) | 17/75 (22.7) | 2.69 (1.1 to 6.4) |
| Maternal age ⩾35 years | 5 (14.7) | 6 (7.5) | 2.13 (0.6 to 7.5) |
| Non-white mother4-150 | 2/32 (6.2) | 4/73 (5.5) | 1.15 (0.2 to 6.6) |
| Social class IV to V4-150 | 3/33 (9.1) | 11/74 (14.9) | 0.57 (0.1 to 2.2) |
| No maternal education after 16 years age4-150 | 18 (52.9) | 37/78 (47.4) | 1.25 (0.6 to 2.8) |
↵4-150 Data not available for some babies.