007 Trends in Serum Testosterone Levels Among Adolescent and Young Adult Men in the United States

      Testosterone deficiency has a global prevalence of 10-40% among adult males and nearly 20% among adolescent and young adult (AYA) men.1,2 Furthermore, serum total testosterone (TT) levels appear to be declining at the population level in the past few decades in adult men, but whether the TT levels decline in AYA men remains unclear.
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