关键词: 小于胎龄儿, 孕期营养, 被动吸烟, 危险因素

Abstract: : Objective To explore risk factors of small-for-gestational-age (SGA) births excluding mother's critical basal disease and obstetric risk factors. Methods A total of 550 SGA and 720 appropriate gestational age newborns were analyzed.Mother's stature, body weight, passive smoking and previous abortion or preterm history were collected and stepwise multivariable logistic regression model was constructed for the outcome. Results Risk factors to SGA were pregnant women with low pre-pregnancy body mass index (<18.5 kg/m², OR=2.16, 95%CI:1.53~3.16), short stature (<155 cm, OR=2.46, 95%CI:1.78~3.48), low weight gain during pregnancy (<9 kg, OR=1.92, 95%CI:1.56~2.58) and passive smoking during pregnancy(OR=2.24, 95%CI:1.65~2.98).Pre-pregnancy BMI>24(OR=0.59, 95%CI:0.42~0.86)and weight gain during pregnancy >18 kg(OR=0.62, 95%CI:0.43~0.86)were protective factors of SGA. Conclusion Excluding known clinical risk factors, pre-pregnancy and pregnancy nutrition should be enhanced to add pregnant woman body weight, and protect them from passive smoking environment to reduce the prevalence of SGA.

Key words: small-for-gestational-age, nutrition during pregnancy, passive smoking, risk factors