All births in sibships with a SIDS infant were intrauterine growth retarded. Structures in the brainstem that have excess synapses may require more DHEA in order to maintain sufficient activity of these structures. When melatonin reduces DHEA at night, there may be insufficient DHEA to properly activate these structures. The hypoglossal nucleus is in the brainstem. SIDS should be more prevalent in women who are higher in testosterone.
African women produce more testosterone than white women.
This is very difficult to find in current journals. I know of one group of endocrinologists who measured testosterone in African American women and European American women and found much higher levels of testosterone in the African Americans, but did, or would not, publish. The following is the best I could find. The pattern of secretion and the range of levels of estradiol and progesterone are similar to those reported in other ethnic groups. Testosterone levels were, in general, higher than corresponding values in Caucasian or Asian women, but were of the same order of magnitude as previously reported in Zambian African women.