Results The determinats of LBEI included factors,such as pretern birth,abnormal maternal health status,maternal medical conditions during pregnancy,multiparity and intrauterine growth retardation.

• 结果低出生体重儿发生的危险因素主要为孕周不足、孕期异常、母亲疾病史、多胎、宫内发育不良等。孕周及出生时体重与死亡呈负相关。