Table 1.
Characteristics of the dataset (N = 11,650) and the subset with complete data on all covariates (N = 9429).
| Maternal characteristic | N with data | Mean (SD) or % | Mean (SD) or % in complete case |
|---|---|---|---|
| Height (cm) | 10,278 | 164.0 (6.69) | 164.1 (6.65) |
| Age (yrs) | 11,650 | ||
| < 20 | 4.84 | 3.45 | |
| 20 − 24 | 19.30 | 16.66 | |
| 25 − 29 | 38.66 | 39.56 | |
| 30 − 34 | 27.60 | 29.95 | |
| 35 + | 9.60 | 10.38 | |
| Parity | 10,830 | ||
| Nulliparous | 44.56 | 44.63 | |
| Multiparous | 55.44 | 55.37 | |
| Smoking in pregnancy | 10,945 | ||
| Never | 66.20 | 68.69 | |
| Prepregnancy/first trimester | 13.85 | 13.41 | |
| Throughout | 19.95 | 17.90 | |
| Highest educational qualification | 10,492 | ||
| CSE/vocational | 29.89 | 28.10 | |
| O level | 34.51 | 34.99 | |
| A level | 22.57 | 23.35 | |
| Degree | 13.03 | 13.55 | |
| Sex of offspring | 11,650 | ||
| Male | 51.12 | 50.79 | |
| Female | 48.88 | 49.21 |