Table 1.
Measures of maternal social economic position and other risk factors (n = 183 637)
| Measure | Summary value |
|---|---|
| Maternal occupation | |
| Manual | 52 238 (28.5%) |
| Non-manual | 89 263 (48.6%) |
| Self-employed | 7135 (3.9%) |
| Other | 35 001 (19.1%) |
| Maternal education status | |
| <9 years | 35 694 (19.4%) |
| 9—10 years | 49 391 (26.9%) |
| Full secondary | 79 990 (43.6%) |
| Higher education | 18 562 (10.1%) |
| Parity | 0 (0–1) |
| Pre-eclampsia | 16 019 (8.7%) |
| Birth weight (g) | 3604 (±491) |
| Birth length (cm) | 51.1 (±2.1) |
| Head circumference (cm) | 34.9 (±1.5) |
| Maternal infection | 2209 (1.20%) |
| Neonatal infection | 358 (0.19%) |
| Delivery | |
| Unassisted vaginal delivery | 157 458 (85.7%) |
| Instrumental delivery | 14 284 (7.8%) |
| Caesarean section | 11 895 (6.5%) |
| Year of birth | |
| 1973 | 46 680 (25.4%) |
| 1974 | 48 532 (26.4%) |
| 1975 | 45 354 (24.7%) |
| 1976 | 43 071 (23.5%) |
| Maternal age (years) | 26.8 (±4.8) |
Data are mean (±SD), median (IQR) or n (%) as appropriate.