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. 2006 Jul 1;60(7):762–769. doi: 10.1111/j.1742-1241.2006.00992.x

Table 6.

Estimates of hypogonadism in men aged at least 45 years visiting a doctor's office relative to US census data

Prevalence (%) Men with hypogonadism (TT <300 ng/dl)
All men (38.7) 13.8 million
Treated men (3.7)  1.3 million
Untreated men (34.9) 12.5 million

TT, total testosterone. Data extrapolated from Lethbridge-Cejku et al. (11) and Population Division US Census Bureau (12).