Table 1.

Demographic Characteristics of Children in the Study Born in Taiwan Between the Years 2004 to 2015

	Cases (n=2,780)	Non-cases (n=2,291,512)
	N (Percent)	N (Percent)
Maternal age
Mean (SD)	30.11 (4.8)	30.35 (4.8)
<20	64 (2.3%)	44,569 (1.9%)
20–29	1,282 (46.1%)	1,006,576 (44.0%)
30–34	1,013 (36.5%)	855,183 (37.4%)
35–39	358 (12.9%)	332,975 (14.6%)
40+	61 (2.2%)	47,974 (2.1%)
Missing	2	4,235
Paternal age
Mean (SD)	33.16 (5.4)	33.30 (5.4)
<20	11 (0.4%)	7,293 (0.3%)
20–29	739 (27.9%)	572,462 (26.3%)
30–34	990 (37.4%)	845,920 (38.8%)
35–39	628 (23.7%)	531,910 (24.4%)
40+	280 (10.6%)	221,324 (10.2%)
Missing	132	112,603
Family income
<30759	719 (27.0%)	550,116 (25.0%)
30759–48200	690 (25.9%)	547,313 (24.9%)
48200–73317	627 (23.5%)	553,088 (25.1%)
≥73317	630 (22.7%)	550,151 (25.0%)
Missing	114	90,844
The urbanization level of the inhabited area
High	1,404 (50.5%)	1,220,284 (53.3%)
Middle	1,103 (39.7%)	860,711 (37.6%)
Low	271 (9.8%)	209,766 (9.1%)
Missing	2	751
Parity
1	1,082 (39.0%)	922,722 (40.3%)
2	1,313 (47.2%)	1,124,641 (49.0%)
3 or more	385 (13.8%)	244,149 (10.7%)
Preeclampsia during the index pregnancy
No	2,701 (98.0%)	2,221,659 (98.0%)
Yes	53 (2.0%)	44,971 (2.0%)
Missing	26	24,882
Hypertension before or during pregnancy
Maternal hypertension (Any hypertension before or during pregnancy)
No	2,664 (96.8%)	2,194,415 (96.8%)
Yes	92 (3.3%)	72,656 (3.2%)
Missing	24	24,441
Chronic hypertension (Only with hypertension before 20 weeks of gestation)
No	2,715 (98.9%)	2,228,385 (99.0%)
Yes	28 (1.1%)	22,285 (1.0%)
Missing	37	40,842
Gestational hypertension (hypertension in pregnancy after 20 weeks of gestation)
No	2,725 (98.9%)	2,247,883 (99.2%)
Yes	29 (1.1%)	18,490 (0.8%)
Missing	26	25,139
Chronic hypertension during pregnancy (chronic hypertension before pregnancy and hypertension during pregnancy
No	2739 (99.8)	2,243,334 (99.6)
Yes	<5	7,333 (0.4)