Mean harm avoidance score
For females, the gap between Norwegian Americans (the highest) and Mexican Americans (the lowest) is eight-tenths of a standard deviation--a large difference. For males, the black-Mexican gap is four-tenths of an sd--a moderate difference. Mexican Americans are less danger-averse than other groups. It's interesting too that of all males, blacks score the highest on harm avoidance.
The gender gap is largest for Norwegians and smallest for Mex-Ams. Mex-Am women are real outliers here: they are less danger-averse than most male groups.
Estimates of heritability range from 0.2 to 0.6.
The overall gender gap is over one-half of a standard deviation. I'll repeat my point from the last post: The person who steps forward to slay the Jabberwocky is probably going to be a dude. Ok--maybe a Mexican chick.