Moonbear said:
I've cited you multiple studies that refute your claim.
Are you yet to refute the J Rushton research? No. Let me know when you do.
Again, it becomes obvious you are refuting a study you did not read.
Why don't you post the whole study. Of course your bias didn't allow you to do it. Let me help you. And even after adjusting for BMI, which it SHOULD NOT have done, blacks STILL had a 3% increase in testosterone. You're getting proven wrong by your own source. Now I know why you didn't give a link. Here it is for EVERYONE to see:
http://cebp.aacrjournals.org/cgi/content/full/11/10/1041
Serum testosterone concentration appears to be higher in black men than white men, particularly at younger ages. The higher incidence of prostate cancer in blacks has been attributed, at least in part, to this difference. Other factors associated with androgen levels in men include age and obesity. However, most of the studies of adult androgen levels are limited by their cross-sectional design. We conducted longitudinal analyses (Generalized Estimating Equation) of the associations of age, body mass index (BMI), and waist circumference with total and free testosterone and sex hormone-binding globulin (SHBG) concentrations during an 8-year period and compared these hormonal factors between black (n = 483) and white (n = 695) male participants of the Coronary Artery Risk Development in Young Adults (CARDIA) Study. For men ages 24 years and older at the time of the first hormone measurement, increasing age was associated with a statistically significant decrease in serum total and free testosterone and an increase in SHBG (P < 0.05). BMI and waist circumference were inversely associated with total testosterone and SHBG, but only BMI was inversely associated with free testosterone.
After adjustment for age and BMI, total testosterone was higher in blacks (0.21 ng/ml; P = 0.028) than whites, an approximately 3% difference. However, after further adjustment for waist circumference, there was no black-white difference (0.05 ng/ml; P = 0.62). These results indicate that the age-associated decrease in circulating testosterone and increase in SHBG begin during the 3rd decade of life, and that increasing obesity, particularly central obesity, is associated with decreasing total testosterone and SHBG. Results also suggest that the previously observed difference in total testosterone between black and white men could be attributed, for the most part, to racial differences in abdominal obesity.
The CARDIA study is a longitudinal study of young black and white men and women. This cohort provides a unique opportunity for disentangling the associations of age, obesity, and race with hormone levels. The large size of the cohort allows for the detection of small differences in hormone levels between black and white men that could be important biologically, because these differences may act cumulatively over many years. In addition, repeat measurements of body size and blood sampling provide a basis for examining longitudinal changes in serum androgen levels beginning during young adulthood, when many lifestyle changes are occurring. The CMHS was designed to compare 8-year changes in serum hormone levels between black and white male CARDIA participants. In this longitudinal analysis, we compared serum total and free testosterone and SHBG concentrations between black and white men. We also examined the relationships of age and measures of overall obesity (BMI), as well as central obesity (waist circumference; Refs. 16 , 17 ) with androgen and SHBG levels, and on black-white differences in particular.
Among men living in the United States, prostate cancer is the most commonly occurring non-skin cancer and the second most common cause of cancer mortality (1) . However, across all age groups, incidence and mortality rates are considerably higher among blacks compared with whites.
Investigators have proposed (2) that differences in testosterone levels between black and white men could account, at least in part, for the disparate rates of prostate cancer between these two populations. Some studies have reported higher concentrations of total testosterone in black men compared with white men (2, 3, 4, 5) . Results of one of these studies (3) suggest that the black-white difference in testosterone is reduced in older- compared with younger-age groups.
And you complain of Nereid's questions!
To call them questions would be a vast overexaggeration.