妊娠早期丙氨酸转氨酶水平对新生儿出生体重的影响

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目的:探讨妊娠早期丙氨酸转氨酶(ALT)水平及其与体重指数(BMI)的交互作用对新生儿出生体重的影响。方法:收集温州市2014—2016年妊娠早期首次产检的单胎足月分娩的母婴资料。应用倾向性评分匹配方法,对暴露(ALT>40 U/L)和非暴露(ALT≤40U/L)组进行1∶4匹配。采用n logistic回归法分析妊娠早期ALT水平对异常出生体重的影响,以及联合妊娠早期BMI的交互作用。n 结果:多因素分析结果显示,ALT>40 U/L的孕妇分娩巨大儿和大于胎龄儿(LGA)的风险是ALT≤40 U/L孕妇的1.584(95%n CI 1.323~1.896)和1.292(95%n CI 1.142~1.461)倍。妊娠早期ALT与BMI对巨大儿的发生风险存在相加交互作用[相对超危险度比(n RERI)=2.032,95%n CI 0.307~3.757;归因比(n API)=0.448,95%n CI 0.221~0.684;交互作用指数(n S)=2.348,95%n CI 1.274~4.324]。但未发现ALT与BMI对LGA的发生风险存在交互作用,也未发现妊娠早期ALT与低体重儿和小于胎龄儿的关联。n 结论:妊娠早期ALT>40 U/L会增加高出生体重的风险,且对妊娠早期超重或肥胖孕妇的影响更明显。建议对妊娠早期肥胖孕妇加强ALT监测。“,”Objective:To investigate the effect of alanine aminotransferase(ALT) level in early pregnancy and its interaction with maternal body mass index(BMI) on neonatal birth weight.Methods:Data of full-term singleton delivery mother-infant pairs from 2014 to 2016 in Wenzhou were collected. The exposure(ALT>40 U/L) and non-exposure(ALT≤40 U/L) groups were matched using 1∶4 propensity score matching. Logistic regression analysis was used to analyze the relationship between increased ALT level in the first trimester and abnormal birth weight as well as the effect of its interaction with BMI on abnormal birth weight.Results:Multivariate analysis showed that the risks of macrosomia and large for gestational age(LGA) in pregnant women with ALT>40 U/L were 1.584(95%n CI 1.323-1.896) and 1.292(95%n CI 1.142-1.461) compared with those with ALT≤40 U/L. ALT in the first trimester displayed an additive interaction with BMI on the risk of macrosomia [the relative excess risk due to interaction(n RERI)=2.032, 95%n CI 0.307-3.757, the attributable proportion due to interaction(n API)=0.448, 95%n CI 0.221-0.684, the synergy index(n S)=2.348, 95%n CI 1.274-4.324]. In addition, there was no interaction between ALT and BMI on the risk of LGA, and nor did the association of ALT in the first trimester with low birth weight or small for gestational age exist.n Conclusion:ALT>40 U/L in the first trimester increases the risk of high birth weight, especially in overweight or obese pregnant women in the first trimester. Therefore, it is suggested to strengthen the monitoring of ALT level in obese pregnant women during the first trimester.
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