The girls were followed longitudinally, which involved multiple regular visits for each girl. Researchers said this method provided a good perspective of what happened to each girl and when it occurred.
Researchers found the respective ages at the onset of breast development varied by race, body mass index (obesity), and geographic location.
Breast development began in white, non-Hispanic girls, at a median age of 9.7 years —earlier than previously reported.
Black girls continue to experience breast development earlier than white girls, at a median age of 8.8 years.
The median age for Hispanic girls in the study was 9.3 years, and 9.7 years for Asian girls.
Body mass index was a stronger predictor of earlier puberty than race or ethnicity.
Although the research team is still working to confirm the exact environmental and physiological factors behind the phenomenon, they conclude the earlier onset of puberty in white girls is likely caused by greater obesity.
新的研究结果显示,超重是女生早熟最明显的预警因素,并且相比之前的报道,超重对白人女生早熟的影响更迅速。
这个由多个机构通过对美国的长期观察得出的研究结果在美国儿科杂志上称,各个人种的女生早熟的现象出现的越来越早。
首席调查员M.D.弗兰克·比罗说:“女生的早熟现象对心理和物理学都有重要的临床意义。
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