Low digit ratio (2D:4D) is associated with delayed menarche.

@article{Matchock2008LowDR,
  title={Low digit ratio (2D:4D) is associated with delayed menarche.},
  author={Robert L. Matchock},
  journal={American journal of human biology : the official journal of the Human Biology Council},
  year={2008},
  volume={20 4},
  pages={
          487-9
        }
}
The prenatal environment of the human fetus is now known to have lasting physiological and behavioral effects into childhood and adulthood. The objective of this study was to examine the relationship between early testosterone exposure, as measured by the ratio of the length of the 2nd and 4th digits (2D:4D ratio), and age of menarche. Retrospective, self-report data on menarcheal age were obtained from 206 healthy female college students, as well as finger length ratio data from both hands… CONTINUE READING
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