Does sex matter? Association of fetal sex and parental age with pregnancy outcomes in Taiwan: a cohort study

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*

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