Table 1.
Maternal characteristics, pregnancy and infant outcomes by paternal age group.
| Paternal age (years) | ||||
|---|---|---|---|---|
| Maternal characteristics | <25 (n = 752) | 25–34 (n = 48,545) | 35–44 (n = 19,263) | >44 (n = 1,404) |
| Maternal age (mean, 95%CI) | 24.0 (22.00–29.00) | 29.0 (25.0–34.0) | 35.0 (29.0–40.0) | 37.0 (29.0–43.0) |
| Maternal BMI (mean, 95%CI) | 19.9 (16.70–25.94) | 20.6 (17.4–26.0) | 21.3 (17.9–26.9) | 21.3 (18.0–26.7) |
| Pregnancy outcomes | ||||
| Gestational weeks (mean, 95%CI) | 39.30 (36.8–40.0) | 39.20 (37.0–41.0) | 38.60 (36.4–40.5) | 38.60 (36.2–40.4) |
| Preterm birth (n, %) | 37 (4.9) | 2,328 (4.8) | 1,226 (6.4) | 110 (7.8) |
| Very early preterm birth (n, %) | 7 (0.9) | 382 (0.8) | 274 (1.4) | 26 (1.9) |
| Gestational diabetes (n, %) | 58 (7.7) | 5,693 (11.7) | 3,523 (18.3) | 321 (22.9) |
| Gestational hypertension (n, %) | 27 (3.6) | 1,806 (3.7) | 926 (4.8) | 87 (6.2) |
| Infant outcomes | ||||
| Birth weight (mean, 95%CI) | 3,340 (2,641.5–4,057.0) | 3,330 (2,650.0–4,020.0) | 3,345 (2,610–4,035) | 3,311 (2,496.2–4,057.5) |
| Low birth weight (n, %) | 25 (3.3) | 1,315 (2.7) | 676 (3.5) | 70 (4.9) |
| Macrosomia (>4,000 g) | 46 (6.1) | 2,588 (5.3) | 1,115 (5.8) | 86 (6.1) |
| Small for gestational age (10%), (n, %) | 20 (2.7) | 918 (1.9) | 304 (1.6) | 18 (1.3) |
| Large for gestational age (90%), (n, %) | 127 (16.9) | 7,939 (16.4) | 3,947 (20.5) | 296 (21.0) |
| Low 5-minute Apgar score (<8), (n, %) | 23 (3.1) | 1,374 (2.8) | 682 (3.5) | 55 (3.9) |
| Adverse fetal composite, (n, %) | 1 (0.1) | 191 (0.4) | 82 (0.4) | 6 (0.4) |
Values are numbers (percentages) unless stated otherwise. Adverse fetal composite: stillbirth, delivery earlier than 28 weeks, birth weight less than the third percentile for gestational age and sex.