@TriversRobert No question there is an average sex difference in digit ratio. Question is if it's a good marker of prenatal T variance. CAIS women show same variability in digit ratio as XX women which points to within sex variation not being mainly due to
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XY subjects with complete androgen insensitivity had female-typical 2D:4D indicating androgen action on digit ratio. https://t.co/feuq2QYBw7