Table 1.
Baseline characteristics of the study cohort with subanalysis of winter-borns and summer-borns.
| Whole cohort | Winter-born | Summer-born | p-value | |
|---|---|---|---|---|
| n | 2999 | 1499 (one missing) | 1500 | |
| Number of males (% of whole cohort) | 1580 (52.7%) | 771 (51.4%) | 809 (53.9%) | 0.16 |
| Birth weight in g (± SD) | 3306 (565) | 3313 (563) | 3299 (566) | 0.49 |
| Gestational age in weeks (± SD) | 38.8 (1.8) | 38.8 (1.8) | 38.8 (1.7) | 0.57 |
| Maternal age in years (± SD) | 30.4 (5.5) | 30.4 (5.6) | 30.5 (5.4) | 0.61 |
| Ethnic groups n (%) | 0.64 | |||
| White British | 1774 (59.1%) | 877 (58.5%) | 897 (59.8%) | |
| Any other White | 264 (8.8%) | 134 (8.9%) | 130 (8.7%) | |
| Asian | 494 (16.5%) | 249 (16.6%) | 245 (16.4%) | |
| Black | 173 (5.8%) | 90 (6.0%) | 83 (5.5%) | |
| Mixed White and Black | 94 (3.1%) | 53 (3.5%) | 41 (2.7%) | |
| Mixed White and Asian | 45 (1.5%) | 21 (1.4%) | 24 (1.6%) | |
| Any other mixed | 156 (5.2%) | 76 (5.1%) | 80 (5.3%) |