Age at menarche and racial comparisons in US girls
Age at menarche and racial comparisons in US girls
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DOI：
10.1542/peds.111.1.110
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发表时间：
2003-01-01
期刊：
影响因子：
8
通讯作者：
Sun, SS
中科院分区：
文献类型：
--
作者：
Chumlea, WC;Schubert, CM;Sun, SS
背景。对美国女孩性成熟开始时间变化的担忧增加了对全国样本初潮年龄最新信息的需求。由于样本的种族构成和年龄，以前的报告很少，解释也很有限。 目的。本研究的目的是估计第三次全国健康和营养检查调查中所有美国女孩以及非西班牙裔白人、黑人和墨西哥裔美国女孩的初潮年龄分布，并测试种族差异。设计。月经状况数据收集自 2510 名 8.0 至 20.0 岁女孩。第三次全国健康与营养调查采用了复杂的、分层的、多阶段的概率聚类设计。 SUDAAN 用于计算在某个年龄达到初潮的女孩的比例。通过概率分析估计初潮年龄，即 10%、25%、50%、75% 和 90% 的女孩初潮年龄。结果。不到 10% 的美国女孩在 11 岁之前开始月经，90% 的美国女孩在 13.75 岁之前开始月经，中位年龄为 12.43 岁。这个初潮年龄与 1973 年报道的美国女孩的初潮年龄没有显着差异（早了 0.34 岁）。非西班牙裔黑人女孩的初潮年龄显着早于白人女孩，分别为 10%、25% 和 50%，而墨西哥裔美国女孩仅显着早于白人女孩，为 25%。结论。总体而言，美国女孩并没有比过去更早地获得生育潜力。非西班牙裔黑人女孩的初潮年龄明显早于非西班牙裔白人和墨西哥裔美国女孩。
Background. Concern regarding change in the onset of sexual maturation of US girls has increased the need for current information on age at menarche from a national sample. Previous reports have been sparse and interpretation has been limited because of the racial composition and ages of the samples.Objective. The objectives of this study were to estimate the distribution of age at menarche for all US girls and for non-Hispanic white, black, and Mexican American girls in the Third National Health and Nutrition Examination Survey and to test for racial differences.Design. Menstrual status data were collected from 2510 girls aged 8.0 to 20.0 years. The Third National Health and Nutrition Examination Survey followed a complex, stratified, multistage probability cluster design. SUDAAN was used to calculate proportions of girls reaching menarche at an age. Ages at menarche were estimated by probit analysis at the ages at which 10%, 25%, 50%, 75%, and 90% of the girls attained menarche.Results. Less than 10% of US girls start to menstruate before 11 years, and 90% of all US girls are menstruating by 13.75 years of age, with a median age of 12.43 years. This age at menarche is not significantly different (0.34 years earlier) than that reported for US girls in 1973. Age at menarche for non-Hispanic black girls was significantly earlier than that of white girls at 10%, 25%, and 50% of those who had attained menarche, whereas Mexican American girls were only significantly earlier than the white girls at 25%.Conclusion. Overall, US girls are not gaining reproductive potential earlier than in the past. The age at menarche of non-Hispanic black girls is significantly earlier than that of non-Hispanic white and Mexican American girls.