Meta‐analysis of digit ratio 2D:4D shows greater sex difference in the right hand

@article{Hnekopp2010MetaanalysisOD,
  title={Meta‐analysis of digit ratio 2D:4D shows greater sex difference in the right hand},
  author={Johannes H{\"o}nekopp and Steven J. Watson},
  journal={American Journal of Human Biology},
  year={2010},
  volume={22}
}
Our aims are, first, to describe the sex difference in the length ratio of the second and fourth digits (2D:4D), which likely reflects prenatal testosterone levels in humans. Second, to infer the loss of reliability observed in 2D:4D based on self‐measured finger lengths. 
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It is suggested that the digit ratio can predict adult penile size and that the effects of prenatal testosterone may in part explain the differences in adultPenile length.
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References

SHOWING 1-10 OF 140 REFERENCES
Digit Ratios (2D:4D and other) and Relative Thumb Length: A Test of Developmental Stability
TLDR
These findings mirror those reported for the second-to-fourth digit ratio (2D:4D), a likely biomarker for the organizational (permanent) effects of prenatal androgens on the human brain and body, and appear to be developmentally unstable.
A longitudinal study of digit ratio (2D:4D) and other finger ratios in Jamaican children
Digit ratio (2D:4D), dominance, reproductive success, asymmetry, and sociosexuality in the BBC Internet Study
  • J. ManningB. Fink
  • Psychology
    American journal of human biology : the official journal of the Human Biology Council
  • 2008
TLDR
The BBC Internet Study of sex differences in which finger lengths were self‐measured shows sexual dimorphism, ethnic differences and higherDimorphism of right 2D:4D than left, thereby indicating that 2D-4D does measure real between‐participant variation.
Photocopies Yield Lower Digit Ratios (2D:4D) Than Direct Finger Measurements
TLDR
Differences in digit ratios obtained from photocopies and direct measurements, and these differences arise from length differences recorded from the different protocols, should not be combined within one study nor should they be used together in comparative studies.
Are 2D:4D finger-length ratios related to sexual orientation? Yes for men, no for women.
  • R. Lippa
  • Psychology, Medicine
    Journal of personality and social psychology
  • 2003
TLDR
Findings add to evidence that prenatal hormonal factors may be linked to men's sexual orientation as well as ethnic groups, after ethnicity was taken into account.
Digit Ratio (2D:4D), Lateral Preferences, and Performance in Fencing
TLDR
The present research tested the hypothesis that 2D:4D might be a performance indicator for men across a variety of sports and found it to be related to high performance in running, soccer, and skiing.
The 2nd:4th digit ratio and asymmetry of hand performance in Jamaican children
TLDR
Testosterone, particularly prenatal testosterone, has been implicated in the aetiology of many extragenital sexually dimorphic traits and it is suggested that the 2D:4D ratio may be associated with the expression of other sexuallyDimorphic behavioural traits.
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