. 2015 Apr 1;10(3):163–167. doi: 10.1089/bfm.2014.0116

Table 2.

Association of Breastfeeding and Maternal Hypertension Among 9,128 Parous Women in Beijing, China

	Model 1		Model 2		Model 3		Model 4
	Crude OR	95% CI	Adjusted OR	95% CI	Adjusted OR	95% CI	Adjusted OR	95% CI
Breastfeeding
No	1.01	0.92, 1.10	1.08	0.99, 1.18	1.11^a	1.01, 1.22^a	1.18^a	1.05, 1.32^a
Yes	1.00	Referent	1.00	Referent	1.00	Referent	1.00	Referent
p value for trend	0.90		0.10		0.03		0.01
Duration (months) of breastfeeding
None	1.00	Referent	1.00	Referent	1.00	Referent	1.00	Referent
>0–6	0.83^a	0.74, 0.94^a	0.82^a	0.72, 0.93^a	0.87^a	0.76, 0.99^a	0.87^a	0.76, 0.99^a
>6–12	1.06	0.94, 1.19	0.95	0.85, 1.08	0.94	0.83, 1.07	0.83^a	0.68, 1.00^a
>12	1.09	0.97, 1.23	1.01	0.90, 1.14	0.90	0.80, 1.02	0.79^a	0.65, 0.97^a
p value for trend	0.001		0.01		0.12		0.04

Model 2 was adjusted for age. Model 3 was adjusted for age, body mass index, waist to hip ratio, working status, drinking, and family history of hypertension. Model 4 was adjusted for all covariates, including age, body mass index, waist to hip ratio, working status, drinking, family history of hypertension, age of menarche, menopause, educational level, smoking, contraceptive use, age of child-bearing, and postpartum body mass index.

^{^a}

Compared with the referent, the p value for this group was <0.05.

CI, confidence interval; OR, odds ratio.