Digit ratio
Ratio of lengths of fingers / From Wikipedia, the free encyclopedia
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The digit ratio is the ratio taken of the lengths of different digits or fingers on a hand. In modern sciences, the 2D:4D ratio has become the most commonly studied digit ratio and is calculated by dividing the length of the index finger of a given hand by the length of the ring finger of the same hand. Some studies claimed that males have a lower 2D:4D ratio than females, on average; however, there are studies showed contradictory findings.[1]
Although studies have claimed to show a correlation between the 2D:4D digit ratio and various physical and behavioral traits,[2] these studies have drawn criticism for irreproducible or contradictory findings,[3][4][5] exaggerated claims of usefulness,[6][7] and lack of high quality research protocols.[7]