Declines in birth weight and fetal growth independent of gestational length.
Declines in birth weight and fetal growth independent of gestational length.
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DOI:
10.1097/aog.0b013e318278d014
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发表时间:
2013-01
影响因子:
7.2
通讯作者:
Oken E
中科院分区:
文献类型:
--
作者:
Morisaki N;Esplin MS;Varner MW;Henry E;Oken E
Birth weight is decreasing in the US and elsewhere, even among term singletons, although trends in most maternal characteristics should contribute to increased birth weight. Some studies have attributed this decline to the simultaneous decrease in gestational length. Using data from Intermountain Healthcare, where a successful initiative reduced the number of early term (37–38 week) elective deliveries, we examined trends in birth weight, small-for-gestational-age (SGA), and large-for-gestational-age (LGA) among 219,694 singleton infants born July 2000 to December 2008 at 37–41 weeks gestation. Over the 8.5 years, births through scheduled deliveries at 37–38 weeks decreased (9.4% to 4.4%), but overall scheduled deliveries increased (29% to 34%) and mean gestational age at birth (39.1 weeks) did not change. Mean birth weight (3410g to 3383g) and LGA (9.0% to 7.4%) both decreased, whereas SGA increased (7.5% to 8.2%). In multivariable analyses adjusting for maternal and infant characteristics, birth weight decreased (36g; 95% CI: 31, 42), especially among infants born at 37–38 weeks (40g; 30, 49) or that had medical indications for urgent deliveries (48g; 34, 63). Odds of LGA decreased (0.84; 0.80, 0.88) and odds of SGA increased (1.14; 1.08, 1.20). Even in a population where gestation length did not change, birth weight and fetal growth declined. Decrease in not only gestational length but in fetal growth as well is likely to be contributing to the widely observed recent decrease in birth weight.
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DOI:
10.1007/bf03404359
发表时间:
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影响因子:
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通讯作者:
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