Characteristic | Non-ART (\(N = 983\))\(^1\) | ART (\(N = 962\))\(^1\) | p value\(^2\) |
---|---|---|---|
Male (%) | 470 (48%) | 505 (52%) | 0.039 |
Maternal age (years) | 30 (27–33) | 33 (31–36) | <0.001 |
Paternal age (years) | 32 (29–36) | 35 (32–38) | <0.001 |
Gestational age (weeks) | 40 (39–41) | 40 (39–41) | 0.090 |
 (No data) | 4 | 0 |  |
Birth weight (g) | 3650 (3330–3970) | 3540 (3190–3850) | <0.001 |
 (No data) | 0 | 1 |  |
First child | 461 (47%) | 673 (70%) | <0.001 |
Maternal BMI (kg/m\(^2\)) | 23 (21–26) | 23 (21–26) | 0.4 |
 (No data) | 14 | 17 |  |
Maternal smoking | Â | Â | <0.001 |
 Never | 490 (50%) | 494 (52%) |  |
 Past smoker | 253 (26%) | 358 (37%) |  |
 1st trimester | 132 (13%) | 62 (6.5%) |  |
 1st trimester and after | 104 (11%) | 44 (4.6%) |  |
 (No data) | 4 | 4 |  |