It is an interesting question. Never thought about it before. I am copying a research that I read in google.
"Testosterone levels do not appear to explain ethnic differences in prostate cancer incidence, body composition, and bone loss, report researchers.
They add that the fact they found no significant differences in testosterone levels among Black, Hispanic, and White men means that normative ranges did not need to be adjusted by race for diagnosing androgen deficiency in men aged between 30 and 79 years.
Heather Litman (Boston University, Massachusetts, USA) and colleagues note, however, that further investigation is needed to determine whether differences in dihydrotestosterone (DHT) levels and the ratio of DHT to testosterone contribute to ethnic variations in prostate cancer incidence, body composition, and bone mass.
The researchers studied data from the Boston Area Community Health Survey for 2301 men aged 30 to 79 years, of whom 1899 provided blood samples. Among the participants, 538 were Black, 651 were Hispanic, and 710 were White.
Testosterone levels did not vary across the ethnic groups. Even after taking into account age, body mass index, and the number of hours since awakening that blood was taken, there were no significant ethnic differences in testosterone values."
Hope it helps!
