The association between physiologic testosterone levels, lean mass, and fat mass in a nationally representative sample of men in the United States

An observational study published in Steroids analyzed data from 252 men aged 18-85 from the 1999-2000 NHANES dataset to examine the relationship between physiological testosterone levels and body composition. The study found that men in the highest testosterone quartile had significantly greater lower-body lean mass (+22.1%, p=0.003) and upper-body lean