Comparison of maternal baseline characteristics between case children and control children
| Characteristics | Cases | Controls | p Value |
|---|---|---|---|
| Age at delivery (mean, SD) | 28.9 (5.6) | 30.2 (4.6) | 0.002 |
| Maternal social class | |||
| Manual | 26 (14.8%) | 79 (11.2%) | 0.187 |
| Non-manual | 62 (35.2%) | 295 (41.9%) | |
| Single/widowed | 87 (49.4%) | 325 (46.2%) | |
| Missing | 1 (0.6%) | 5 (0.7%) | |
| Paternal social class | |||
| Paternal manual | 71 (40.3%) | 329 (46.7%) | 0.193 |
| Paternal non-manual | 47 (26.7%) | 183 (26.0%) | |
| Maternal non-manual | 57 (32.4%) | 184 (26.1%) | |
| Missing | 1 (0.6%) | 8 (1.1%) | |
| Marital status | |||
| Single/widowed/divorced/separated | 62 (35.2%) | 222 (31.5%) | 0.324 |
| Married | 113 (64.2%) | 482 (68.4%) | |
| Missing | 1 (0.6%) | 0 (0%) | |
| BMI (mean, SD; missing cases=12, missing controls=39) | 25.2 (5.1) | 25.5 (5.1) | 0.407 |
| Smoking | |||
| Non-smoker | 107 (60.8%) | 477 (67.8%) | 0.034 |
| Smoker/ex-smoker | 68 (38.6%) | 209 (29.7%) | |
| Missing | 1 (0.6%) | 18 (2.6%) | |
BMI, body mass index.