We examined the influence of two measures of maternal nutritional status: prepregnant body mass (kilograms/meter2 ) and Weight gain during pregnancy (adjusted for duration of gestation) on spontaneous preterm delivery (<37 completed Weeks' gestation) and duration of gestation, as well as on low birthweight (<2,500 grams) and small-for-gestational-age (SGA) in pregnant adolescents. Inadequate Weight gain for gestation increased the risk of spontaneous preterm delivery when prematurity was reckoned by the obstetric estimate (Adjusted Odds Ratio, AOR = 1.75 95% CI 1.22-2.50) or from the mother's LMP (AOR = 1.49 95% CI 1.10-2.02). In linear models, gestation duration was significantly reduced, by more than half a week, when reckoned from eiter estimate of gestation. However, the association between preterm birth or gestation duration and prepregnancy body mass was not consistent and depended on the method of estimating gestation. Low birthweight and SGA were each significantly associated with inadequate weight gain during pregnancy as well as with prepregnant body mass. These results suggest that current maternal nutritional status, as measured by weight gain during pregnancy, may influence preterm delivery and gestation duration. The inconsistent results obtained with prepregnancy body mass may reflect a size bias inherent in the obstetric estimate of gestation, rather than effects of prepregnant maternal nutritional status on gestation.

译文

我们研究了两种母亲营养状况指标的影响: 怀孕前体重 (千克/米2) 和怀孕期间体重增加 (根据妊娠持续时间进行调整) 对自发早产 (<37个完整妊娠周) 和妊娠持续时间的影响,以及怀孕青少年的低出生体重 (<2,500克) 和小于胎龄儿 (SGA)。当产科估计值 (调整后的比值比,AOR = 1.75 95% CI 1.22-2.50) 或母亲的LMP (AOR = 1.49 95% CI 1.10-2.02) 估计早产时,妊娠体重增加不足会增加自发早产的风险。在线性模型中,根据eiter对妊娠的估计,妊娠持续时间显着减少了半周以上。然而,早产或妊娠持续时间与孕前体重之间的关联并不一致,并且取决于估计妊娠的方法。低出生体重和SGA均与怀孕期间体重增加不足以及怀孕前的体重显着相关。这些结果表明,以怀孕期间体重增加衡量的当前孕产妇营养状况可能会影响早产和妊娠持续时间。与孕前体重获得的不一致结果可能反映了产科妊娠估计中固有的大小偏差,而不是孕前孕妇营养状况对妊娠的影响。

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