The theory of "the ratio of index finger and ring finger length" between men and women has been debated for many years

The hypothesis of the 2D:4D ratio is that the ring finger of male is longer than the index finger, the ring finger of female is the same length or the index finger is longer than the ring finger

Not all researchers agree with this theory

Another theory is that men have larger body parts, including fingers, which affects the 2D:4D ratio

To test this hypothesis, the researchers collected data on the finger length and 2D:4D ratio of more than 7,500 people, including representatives from three major races, different ages and nationalities; then they compared the 2D:4D ratios in these cohorts And finger length

We assume that if it is the difference in total finger length that affects the 2D:4D ratio rather than gender, then these two indicators will be related

The lack of correlation between the total finger length and the 2D:4D ratio does not confirm the explanation of the allometric growth hypothesis for the difference in the ratio between men and women

"The 2D:4D ratio is a gender dimorphism feature, and the total amount and the degree of gender difference vary from population to population

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