The ratio of 2nd to 4th digit length: a predictor of sperm numbers and concentrations of testosterone, luteinizing hormone and oestrogen.

@article{Manning1998TheRO,
  title={The ratio of 2nd to 4th digit length: a predictor of sperm numbers and concentrations of testosterone, luteinizing hormone and oestrogen.},
  author={J. Manning and D. Scutt and J. Wilson and D. I. Lewis-Jones},
  journal={Human reproduction},
  year={1998},
  volume={13 11},
  pages={
          3000-4
        }
}
The differentiation of the urinogenital system and the appendicular skeleton in vertebrates is under the control of Hox genes. [...] Key Result We showed that (i) 2D:4D in right and left hands has a sexually dimorphic pattern; in males mean 2D:4D = 0.98, i.e. the 4th digit tended to be longer than the 2nd and in females mean 2D:4D = 1.00, i.e. the 2nd and 4th digits tended to be of equal length.Expand
Study of Sexual Dimorphism in Second-to-fourth Digit Length Ratio (2D: 4D) in the Green-Bellied Lizard (Darevskia cholorogaster) from Iran
TLDR
The digits ratios observed in D. cholorogaster could be referred to microhabitat use by this species on different surfaces, besides basic genetic pattern and other ecological effects as foraging and mating, and supported a genetic pattern seen in humans and most mammals, inconsistent withbasic genetic pattern in reptiles. Expand
Measurement of the digit lengths and the anogenital distance in mice
TLDR
In humans, research has demonstrated the ratio of the 2nd to 4th digit lengths (2D:4D) are: (i) sexually dimorphic with males having a lower ratio than females, the latter having near equidistant lengths, and (ii) correlated with prenatal androgen levels. Expand
Digit ratios among the modern population of the Canary Islands
TLDR
Sexual differences in the index to ring finger length ratio (2D:4D ratio) have been observed since more than 150 years ago, and they are already present in the foetus, although differences between sexes are subjected to ethnic variations. Expand
2nd to 4th digit ratios, fetal testosterone and estradiol.
TLDR
Preliminary findings lend support to an association between low 2D:4D and high levels of FT relative to FE, and high 2D-4D with low FTrelative to FE. Expand
Dependence of the Ratio of the Lengths for the Second and Fourth Fingers (2D : 4D) on the Prenatal Development Conditions in Water Vole (Arvicola amphibius L.)
TLDR
The ratio of the lengths of the second and fourth fingers (2D : 4D) is used as a marker of prenatal androgenization and the possibility of using this index in environmental population studies as a markers of prenatal hormone-related maternal effects was made. Expand
The 2nd:4th digit ratio, sexual dimorphism, population differences, and reproductive success. evidence for sexually antagonistic genes?
  • Manning, Barley, +9 authors Szwed
  • Biology, Medicine
  • Evolution and human behavior : official journal of the Human Behavior and Evolution Society
  • 2000
TLDR
Comparison of 2D:4D ratios of 62 father:child pairs gave a significant positive relationship, suggesting that genes inherited from the father had some influence on the formation of the 2D-4D ratio. Expand
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. Expand
Sexual Dimorphism in the Prenatal Digit Ratio (2D:4D)
TLDR
The 2D:4D ratio, thus, seems to increase after birth in both men and women, with the second digit growing faster than the fourth digit (positive allometric growth of digit two) and perhaps more so in women than in men. Expand
A longitudinal study of digit ratio (2D:4D) and other finger ratios in Jamaican children
TLDR
It is concluded that 2D:4D increases slightly with age in children with the effect less marked for the right hand (i.e. the hand which is likely to show the strongest association with prenatal steroids), 2D:[4D]4D is sexually dimorphic from an early age, and the rank order of 1D:3D is stable in children. Expand
Differences in the 2nd to 4th digit length ratio in humans reflect shifts along the common allometric line
TLDR
It is demonstrated that the sexes do not greatly differ in the scaling between the 2nd and 4th digit, and previously published results on the 2D : 4D ratio are biased by its covariation with finger length. Expand
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