Unfortunately, studies of 2d:4d have produced inconsistent results, even in large samples. Check if you have access through your login credentials or your institution. In addition, 2d:4d on the left hand did not differ significantly for any of the four groups. Some des daughters report having an incompetent cervix, which can be the cause for some second-trimester pregnancy losses. Less than 50% of 3600 respondents to a california health survey have ever heard of des.
Taken together, these studies involved over 3,000 men in the united states. You may remember them; the ones full of mazes, riddles, simple math and word fill-ins.