Low birth weight in a municipality in the southeast region of Brazil

ABSTRACT Objective: to identify the prevalence of low birth weight in the city of São Paulo. Method: epidemiological cross-sectional study with data collected by means of the Brazilian Live Birth Information System related to births occurred in the city of São Paulo between 2007 and 2013. Maternal, gestational, childbirth, and neonatal variables were analyzed descriptively and by association. Results: 9.65% (1,342,655) of live births were underweight (mean of 3234.55 grams in the term group and 2312.17 in the pre-term group) with a mean maternal age of 27.53 years old. The risk factors identified include maternal age, not having a partner, low maternal level of education, other race rather than white, pre-term pregnancy, multiple births, low number of prenatal check-ups, and cesarean delivery. Conclusion: knowledge of this evidence favors planning the care provided by defining strategies to reduce it and consequently improve maternal and infant health care.

摘要
一、研究目的：明确圣保罗市低出生体重儿的患病率。
二、研究方法：采用流行病学横断面研究设计，使用巴西活产信息系统（Brazilian Live Birth Information System）收集2007至2013年间圣保罗市境内的活产儿相关数据，对产妇、妊娠、分娩及新生儿相关变量进行描述性分析与关联分析。
三、研究结果：共有9.65%（1,342,655例）的活产儿为低出生体重儿；足月儿组平均出生体重为3234.55克，早产儿组为2312.17克，产妇平均年龄为27.53岁。本次研究识别出的危险因素包括产妇年龄、无配偶、低学历、非白人种族、早产妊娠、多胎妊娠、产前检查次数不足以及剖宫产分娩。
四、研究结论：掌握此类循证依据有助于制定针对性策略以降低低出生体重儿的发生率，进而改善孕产妇与婴幼儿的医疗照护质量，为相关诊疗服务的规划提供支撑。