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Previous studies suggest that male testosterone concentrations have declined over time. To explore this in a large US population, we examined testosterone and free testosterone concentrations in National Health and Nutrition Examination Surveys (NHANES) from 1988–1991 and 1999–2004. We also examined sex hormone‐binding globulin (SHBG), estradiol, and androstanediol glucuronide (3α‐diol‐G) over the...
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