Study on Relationship between Digit Ratio (2D:4D) and Body Mass Index (BMI) of Japanese Young People

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  • 日本人若者における示指環指比(Digit Ratio(2D:4D))と体格指数(BMI)との関連性について
  • ニホンジン ワカモノ ニ オケル ジユビワ シヒ(Digit Ratio (2D:4D))ト タイカク シスウ(BMI)ト ノ カンレンセイ ニ ツイテ

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Because Digit Ratio (2D:4D) is a simple and effective index for investigating the gender differences in the field of physiological anthropology, this study was designed to examine the relation between 2D:4D and BMI (Body Mass Index), the latter being regarded as a useful biomarker. The 95 Japanese college students who were being studied medically related subjects were participants of this study. Their age ranges were 21.87±3.32 years old in 75 males and 21.50±5.22 years old in 20 females. The lengths of both the index and ring fingers of the right hand from their striations of the metacarpophalangeal joints to their finger-tips, respectively, were measured by a fibre caliper. The BMI was then calculated with the participant's weights and lengths, and the Digit Ratio was calculated through a formula (=2D/4D). Finally, the calculated Digit Ratios were analyzed statistically to find the correlation between Digit Ratio and BMI in accordance with the age group. On the 2D:4D of the male group, the significant difference was observed (p < 0.01), but not seen in female group. Both groups of male and female did not exhibit any correlation between 2D:4D and BMI, but, a moderately strong negative correlation and a significant difference were observed for the BMI value in group of 20 or less who lost weight (r = -0.5076, two-tailed p = 0.0005406). It is suggested that when performing research on the relationship between Digit Ratio and BMI, the participants have to be subdivided according to BMI values.

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