The Association of Prepregnancy Body Mass Index with Pregnancy Outcomes in Chinese Women

Table 4

Effects of prepregnancy BMI on pregnancy outcomes.

Pregnancy outcomes	Underweight ()	Normal ()	Overweight ()	Obese ()
Gestational diabetes	0.778 (0.491-1.231)	Ref	0.996 (0.702-1.414)	2.726 (1.757-4.231)
PPROM	1.902 (1.296-2.790)	Ref	0.845 (0.575-1.243)	0.976 (0.568-1.676)
Anemia	1.218 (0.788-1.882)	Ref	0.973 (0.664-1.428)	0.299 (0.128-0.698)
Postpartum hemorrhage	0.759 (0.356-1.616)	Ref	1.444 (0.874-2.387)	1.254 (0.599-2.628)
Preeclampsia	0.365 (0.048-2.757)	Ref	1.329 (0.517-3.416)	3.766 (1.504-9.427)

Note: prepregnancy BMI groups were defined , normal 18.5-23.9 kg/m², overweight 24-27.9 kg/m², and . , , and . All analyses were adjusted for age, conception method, and the number of pregnancies. Abbreviations: BMI: body mass index; PPROM: preterm premature rupture of membranes.