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Sample characteristics
| Maternal age at birth (years) | |
| M | 32.0 |
| SD | 4.6 |
| Partner's age at birth (years) | |
| M | 33.8 |
| SD | 4.8 |
| Gestational age | |
| Premature, n (%) | 888 (4.7%) |
| Full‐term, n (%) | 17,808 (93.6%) |
| Birth weight (kg) | |
| M | 3.49 |
| SD | 0.51 |
| Child sex | |
| Boy, n (%) | 9667 (50.8%) |
| Girl, n (%) | 9350 (49.2%) |
Note: Premature = 30–36 weeks, full‐term = 37–46 weeks.
