Abstract: Objective To explore the influence factors of low birth weight in Chongqing,and provide references to prevent and reduce the rate of low birth weight. Methods Case-control study method was implemented among 326 low birth weight infants and 326 normal infants from 6 maternal and child health care hospitals.A uniform questionnaire was used to investigate influencing factors,and conditional Logistic regression was used to analyze the data. Results Low birth weight was associate with mother's general information (BMI before pregnancy,education,average monthly income of family,etc.),condition during pregnancy(singleton pregnancy,antenatal care,gestational hypertension,etc.),living habit(smoking,drinking,passive smoking,etc.),and dietary(multivitamin tablets,meat,seafood,etc.).Multivariate analysis showed that average monthly income of family,singleton pregnancy,weight gain during pregnancy,and antenatal care had important protective effects on low birth weight.Meanwhile gestation complicated anemia was the main risk factor. Conclusion The occurrence of low birth weight is influenced by the various factors,so the comprehensive measures should be taken to control it.

Key words: low birth weight, influencing factor, case-control study

摘要： 目的 研究重庆市低出生体重儿的影响因素,为预防和降低全市低出生体重发生率提供理论依据。方法 采用1∶1病例对照研究方法选取重庆市6所妇幼保健院住院分娩的326名低出生体重儿和同期住院分娩的326名正常新生儿作为研究对象,利用问卷进行调查,采用单因素和多因素条件Logistic回归分析所获资料。结果 低出生体重儿的发生可能与母亲一般情况(孕前BMI、受教育程度、家庭平均月收入等)、孕期情况(单胎、产前检查、妊娠期高血压疾病等)、生活习惯(吸烟、饮酒、被动吸烟等)和膳食营养(服用多种维生素片、食用鱼禽肉类、食用海产植物类等)有关。多因素分析结果显示,家庭平均月收入、单胎、孕期增重和产前检查是低出生体重儿的主要保护因素,妊娠期贫血是影响低出生体重儿的主要危险因素。结论 低出生体重儿的发生受多方面因素共同作用的影响,应采取综合措施降低低出生体重儿的发生率。

关键词: 低出生体重儿, 影响因素, 病例对照研究