Table 4.

Association among previous induced abortion and hypertensive disorder of pregnancy.

Variable	Exposed group		Unexposed group		OR(95% CI)	aOR1(95% CI)	aOR2(95% CI)
	N = 1378	Risk(%)	N = 3813	Risk(%)
HDP	57	4.1	201	5.3	0.78(0.57–1.05)	0.67(0.49–0.91)*	0.67(0.49–0.91)*
GH	34	2.5	107	2.8	0.88(0.59–1.30)	0.73(0.49–1.10)	0.72(0.48–1.09)
PE	23	1.7	94	2.5	0.67(0.42–1.06)	0.61(0.38–0.97)*	0.61(0.38–0.98)*

Abbreviations: OR, odds ratio; CI, confidence intervals; aOR, adjusted odds ratio; HDP, hypertensive disorder of pregnancy; GH, gestational hypertension; PE, pre-eclampsia; GDM, gestational diabetes mellitus, BMI, body mass index. ¹Adjustment confounding factors are maternal age, BMI at first antenatal visit, education, history of medical disorders, virus infection. ²Adjustment confounding factors are maternal age, education, BMI at first antenatal visit, virus infection, history of medical disorders, occupation, living area, anemia, GDM, psychological stress, conception climate, infant sex. The crude and adjusted OR and 95% CI of HDP, GH and PE were estimated by multivariable logistic regression. *p < 0.05.