Table 1.
Characteristics of participants, n=4165
| N for valid observation | Mean (SD) | |
|---|---|---|
| Maternal characteristics | ||
| Age at enrollment, years | 4165 | 30.7 (4.7) |
| Educational levels, % | 4027 | |
| No education or primary school | 17.6 | |
| Secondary school | 30.0 | |
| Higher education phase 1 | 23.7 | |
| Higher education phase 2 | 28.7 | |
| Ethnicity, % | 4159 | |
| Dutch | 61.0 | |
| Other Western | 12.4 | |
| Non Western | 26.6 | |
| Marital Status, married/with partner, % | 3989 | 90.5 |
| History of smoking | 4122 | |
| Never | 77.1 | |
| Quit when pregnancy known | 8.4 | |
| Continued in pregnancy | 14.5 | |
| Psychopathology in pregnancy, score | 3606 | 0.25 (0.33) |
| Paternal characteristics | ||
| Age at enrollment, years | 3786 | 33.4 (5.4) |
| Educational level, % | 3158 | |
| No education or primary school | 19.0 | |
| Secondary school | 25.2 | |
| Higher education phase 1 | 20.3 | |
| Higher education phase 2 | 35.6 | |
| Household income, % | 3797 | |
| <€1200 | 6.1 | |
| >€1200 and <€2000 | 15.0 | |
| >€2000 | 78.9 | |
| Maternal health characteristics | ||
| Parity, primipara, % | 4147 | 59.7 |
| Time of blood sampling in pregnancy, weeks | 4165 | 13.4 (1.9) |
| Body mass index at enrollment | 4142 | 24.3 (4.2) |
| Children's characteristics | ||
| Age at time of assessment, months | 3440 | 74 (6) |
| Gender, boy, % | 4165 | 49.8 |
| Gestational age at birth, weeks | 4165 | 40.0 (1.7) |
| Birthweight, grams | 4163 | 3454 (548) |
| Breast feeding at 6 months, yes, % | 3331 | 32.9 |
| Social Responsiveness Scale, score | 3388 | 0.22 (0.24) |
| Pervasive Developmental Problem Scale, score | 4025 | 2.26 (2.54) |
| Maternal C reactive protein, mg/L | 4165 | 6.49 (9.38) |
Numbers are mean (SD) unless otherwise indicated.