Exactly how testosterone affects the foetal digit ratio is not clear.
Athletes with long ring fingers in relation to their index fingers also had superior aerobic capacity.
According to the researchers, it's all down to the ratio between the ring and index fingers being a marker of exposure to testosterone in the womb.
Schizophrenia is another condition that shows a gender bias.
Researchers working at the University of Florida found that patients were likely to have a more feminine digit ratio with a smaller ring finger.
If your hometown is Manning Alberta, discover new user-reviewed businesses local to you, with Yellow .