Is 2D:4D digit ratio related to avowed religion? A study among Mongolian young males from Ulaanbaatar.

Background: The ratio of the second- (2D) to fourth (4D) digit lengths of hand (2D:4D) is a proxy marker of the relative testosterone and estrogen concentration during a relatively narrow period of fetal development that might affect behavioral and personality characteristics.

Aim: To estimate the differences in 2D:4D between different religious groups among a sample of young adult males in Mongolia.

Methods: Two hundred and sixty-five Mongolian male students with mean age of 20.