Table 1. Raw counts and proportions of parental and offspring variables (N=4229).
| Parental variables | N (proportion) | Offspring variables | N (proportion) |
|---|---|---|---|
| Age mother at intake | Ethnicity of child | ||
| <25 years | 443 (0.10) | European | 3120 (0.74) |
| ⩾25 & <30 | 1090 (0.26) | Cape Verdean | 81 (0.02) |
| ⩾30 & <35 | 1905 (0.45) | Moroccan | 153 (0.04) |
| >35 years | 791(0.19) | Surinamese | 233 (0.06) |
| Turkish | 263 (0.06) | ||
| Age biological father at intake | Other | 372 (0.09) | |
| <30 years | 964 (0.23) | ||
| ⩾30 & <35 | 1717 (0.41) | Sex child | |
| ⩾35 & <40 | 1071 (0.25) | Boy | 2114 (0.50) |
| ⩾40 | 477 (0.11) | Girl | 2115 (0.50) |
| BMI mother | Gestational age at time of birth | ||
| <20 | 155 (0.04) | ⩾41.5 weeks | 627 (0.15) |
| ⩾20–<25 | 2148 (0.51) | ⩾40.5 weeks & <41.5 weeks | 1050 (0.25) |
| ⩾25–<30 | 1424 (0.34) | ⩾39.5 weeks & <40.5 weeks | 1173 (0.28) |
| >30 | 502 (0.12) | ⩾38.5 weeks & <39.5 weeks | 748 (0.18) |
| <38.5 weeks | 631 (0.15) | ||
| Smoking mother during pregnancy | |||
| No | 3744 (0.89) | Birth weight infant | |
| Yes | 485 (0.11) | ⩾4000 grams | 645 (0.15) |
| <4000 grams & ⩾3500 | 1434 (0.34) | ||
| Educational level mother | <3500 grams & ⩾3000 | 1413 (0.33) | |
| Primary school or less | 267 (0.06) | <3000 grams | 737 (0.17) |
| Secondary school phase 1 | 436 (0.10) | ||
| Secondary school phase 2 | 1216 (0.29) | Age child at SRS (years) | |
| Higher education phase 1 | 1015 (0.24) | <6 | 1629 (0.68) |
| Higher education phase 2 | 1295 (0.31) | ⩾6 ⩽6.5 | 701 (0.29) |
| >6.5 | 80 (0.03) |
Abbreviations: BMI, body mass index; SRS, Social Responsiveness Scale. Notes: Counts and proportions are based on all individuals with data on vitamin D measured from mid-gestation and/or cord blood and data on the SRS; European is defined as Dutch, European American, Oceania and other European; parental variables and offspring variables were imputed for missing data (see Materials and methods section for details on imputation protocol); Information on missing rates is provided in Supplementary Table 1; ‘Age child at SRS ‘was available for all children included in the SRS analyses; the variable ethnicity of child was missing for seven children, these missing data were not imputed (see Materials and methods section for details on imputation protocol).