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An Outcome-based Approach for the Creation of Fetal Growth Standards: Do Singletons and Twins Need Separate Standards?

机译:建立基于结果的胎儿生长标准的方法:单身和双胞胎是否需要单独的标准?

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摘要

Contemporary fetal growth standards are created by using theoretical properties (percentiles) of birth weight (for gestational age) distributions. The authors used a clinically relevant, outcome-based methodology to determine if separate fetal growth standards are required for singletons and twins. All singleton and twin livebirths between 36 and 42 weeks’ gestation in the United States (1995–2002) were included, after exclusions for missing information and other factors (n = 17,811,922). A birth weight range was identified, at each gestational age, over which serious neonatal morbidity and neonatal mortality rates were lowest. Among singleton males at 40 weeks, serious neonatal morbidity/mortality rates were lowest between 3,012 g (95% confidence interval (CI): 3,008, 3,018) and 3,978 g (95% CI: 3,976, 3,980). The low end of this optimal birth weight range for females was 37 g (95% CI: 21, 53) less. The low optimal birth weight was 152 g (95% CI: 121, 183) less for twins compared with singletons. No differences were observed in low optimal birth weight by period (1999–2002 vs. 1995–1998), but small differences were observed for maternal education, race, parity, age, and smoking status. Patterns of birth weight-specific serious neonatal morbidityeonatal mortality support the need for plurality-specific fetal growth standards.
机译:现代胎儿生长标准是通过使用出生体重(胎龄)分布的理论特性(百分位数)来创建的。作者使用了临床相关的,基于结果的方法来确定单胎和双胎是否需要单独的胎儿生长标准。在排除了缺少信息和其他因素的情况下(n = 17,811,922),排除了美国(1995-2002年)妊娠36至42周之间的所有单胎和双胎分娩。在每个胎龄中确定出生体重范围,在该范围内严重的新生儿发病率和新生儿死亡率最低。在40周的单身男性中,严重的新生儿发病率/死亡率最低,介于3,012 g(95%置信区间(CI):3,008,3,018)和3,978 g(95%CI:3,976,3,980)之间。女性的最佳出生体重范围的下限少了37克(95%CI:21、53)。与单身者相比,双胞胎的最优出生体重低了152 g(95%CI:121,183)。在各个时期(1999-2002年与1995-1998年)的最低出生体重方面没有观察到差异,但是在孕产妇教育,种族,均等,年龄和吸烟状况方面观察到较小的差异。特定于出生体重的严重新生儿发病率/新生儿死亡率的模式支持对多种特定胎儿生长标准的需求。

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