Table 4.
Sex ratios in different outcomes according to paternal and maternal age
| All live births | Gestational hypertension or preeclampsia | Preterm birth | ||||
|---|---|---|---|---|---|---|
| n | Sex ratio | n | Sex ratio | n | Sex ratio | |
| All ages | 1,347,672 | 1.10 | 30,526 | 1.04 | 92,663 | 1.34 |
| Paternal age, y | ||||||
| < 25 | 75,119 | 1.08 | 1466 | 1.16 | 5604 | 1.31 |
| 25–29 | 328,463 | 1.09 | 6570 | 1.03 | 21,190 | 1.36 |
| 30–34 | 520,954 | 1.09 | 11,026 | 1.07 | 33,848 | 1.34 |
| 35–39 | 301,149 | 1.11 | 7524 | 1.02 | 21,736 | 1.34 |
| 40–44 | 93,068 | 1.10 | 2949 | 1.02 | 7753 | 1.31 |
| 45–49 | 21,974 | 1.11 | 760 | 0.96 | 1910 | 1.29 |
| ≥ 50 | 6945 | 1.13 | 231 | 0.89 | 622 | 1.19 |
| P for trend | < 0.001 | P for trend | 0.04 | P for trend | 0.15 | |
| Maternal age, y | ||||||
| < 20 | 23,195 | 1.07 | 426 | 1.01 | 1998 | 1.42 |
| 20–24 | 185,607 | 1.08 | 3242 | 1.11 | 12,124 | 1.31 |
| 25–29 | 487,567 | 1.09 | 9545 | 1.05 | 30,696 | 1.37 |
| 30–34 | 474,148 | 1.10 | 11,010 | 1.04 | 32,143 | 1.33 |
| 35–39 | 156,352 | 1.12 | 5195 | 1.00 | 13,344 | 1.34 |
| ≥ 40 | 20,803 | 1.12 | 1108 | 0.98 | 2358 | 1.23 |
| P for trend | < 0.001 | P for trend | 0.02 | P for trend | 0.20 | |
Note: All p-values were obtained from the two-sided Cochran-Armitage trend test