|  |  | Mean ± sd | Prevalence (%) |
---|---|---|---|---|
Child | Gender | male | Â | 51.3% |
female | 48.7% | |||
 | Birth weight | (grams) | 3524 ±508 |  |
 | BMI z-score | 5 y | −0.27 ±0.99 |  |
 | 6-7 y | −0.29 ±0.94 |  | |
 | 7-8 y | −0.32 ±0.90 |  | |
Mother | Employment | (hours per week) | 17.9 ±11.1 |  |
 | Educational level | Low |  | 8.0% |
Medium | 37.8% | |||
High | 54.2% | |||
 | Country of birth | Netherlands |  | 97.0% |
other | 3.0% | |||
 | BMI | (kg/m 2 ) | 24.0 ±3.8 |  |
 | Alternative lifestylea | (yes vs. no) |  | 17.9% |
Father | Employment | (hours per week) | 37.8 ±10.1 |  |
 | Educational level | Low |  | 12.8% |
Medium | 33.8% | |||
High | 53.4% | |||
 | Country of birth | Netherlands |  | 96.3% |
other | 3.7% | |||
 | BMI | (kg/m 2 ) | 25.0 ±3.1 |  |