Demographic Characteristics, Pregnancy Conditions, and Neonatal Outcomes
COMPLICATIONS
We collected baseline data on the participants’ demographic characteristics and pregnancy-related conditions using questions developed specifically for this study. These questions asked about age, nationality (Han or National minority), education (below undergraduate or undergraduate or above), marital status (married or single), average monthly household income (<6000 yuan or ≥6000 yuan, CNY 6000 yuan [US $884]), residence (urban or rural), height, gestational age, prepregnancy weight, pregnancy weight, parity (primipara or multipara), and complications during pregnancy (yes or no). We acquired information on neonatal outcomes, including birth weight and gestational age at delivery, from the hospital registry databases.