Objective To assess the birth weight of live births with gestational age from 28 to 42 weeks in Minhang District and identify the related factors to provide evidences for improving newborns' constitution. Methods Data on birth weight and other related factors for newborns born during Jan.2006-Nov.2011 were collected by the population-based electronic Health Records (eHR) system in Minhang District,Shanghai,China. Results A total of 206 165 live newborns were enrolled in this analysis.The mean and median birth weight were 3 343 g and 3 320 g for all newborns.Low birth weight rates were 0.6% and 0.9% of male and female newborns,while macrosomia accounted for 9.0% and 5.1%,respectively.The percentage of low birth weight and macrosomia,the average birth weight,gestational age and mother's age were significantly different between males and females (P<0.05).Mean birth weight also differed by sex,birth calendar year,gestational age,mother's age,mode of delivery,residence type and health condition of mother(P<0.05). Conclusion The average birth weight in live births is affected by several factors.Appropriate measures should be implemented to improve the situation.
Key words
birth weight /
influencing factors /
newborn
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