Abstract:Objectives: Tanner (1968, Scientific American, 218(1), [21][22][23][24][25][26][27] concluded that having more siblings delayed menarche, but many subsequent studies have reported diverging results. We thus aimed to investigate whether the initial conclusion remains valid by controlling for sibship size and birth order together, analyzing a large number of observations, drawing on a nationally representative sample, adjusting for childhood socioeconomic status, and considering a developing country. We addition… Show more
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