Methods Body wight index (BWI) was calculated before pregnancy and maternal weight gain and pregnancy outcomes were followed up in 2 584 primipara with singleton births.
方法对2 584例单胎初产妇，测量孕前身高、体重和孕期体重增加情况，计算体重指数（BWI），并随访妊娠结局。
Methods Body wight index (BWI) was calculated before pregnancy and maternal weight gain and pregnancy outcomes were followed up in 2 584 primipara with singleton births.
方法对2 584例单胎初产妇，测量孕前身高、体重和孕期体重增加情况，计算体重指数（BWI），并随访妊娠结局。
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