Onset of breast development in a longitudinal cohort.
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...The underlying causes remain unclear although some suggest higher rates of obesity (Biro et al. 2013) while others suggest epigenetic and environmental influences (Aksglaede et al. 2009; Meeker, 2012; Hagen et al. 2014) as the main contributing factors....
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...Furthermore, there is growing evidence that sexual maturation is occurring progressively earlier in the US and some European countries (Euling et al. 2008; Aksglaede et al. 2009; Biro et al. 2013; Cabrera et al. 2014)....
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...8) Race/Ethnicity Black 168 40 127 34 96 22 391 32 Asian 0 0 5 1 52 12 57 5 Hispanic 248 60 15 4 108 24 371 30 White 0 0 232 61 188 42 420 34 Education of family provider Grade School (1-8), Some High School (9-11) or High School Diploma/GED 232 58 35 10 83 20 350 31...
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