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U.S. ↔ testosterone

Relations (1)

cross_type 0.40 — supporting 4 facts

Testosterone seasonality has been measured in multiple studies conducted in the U.S., directly linking the hormone to this location through research on military veterans [1], men in the Multiple Risk Factor Intervention Trial [2], African-American males [3], and healthy men [4].

Facts (4)

Sources
Seasonal Changes of Serum Gonadotropins and Testosterone in ... frontiersin.org Frontiers 4 facts
measurementPerry et al. (37) studied 65 African-American males in the United States (age range 70–102 years) and found an annual peak for testosterone in winter.
measurementDabbs et al. (30) studied 4,462 military veterans in the United States (age range 32–44 years) and found an annual peak for testosterone in autumn.
measurementDai et al. (31) studied 243 men in the United States (age range 35–73 years) as part of the Multiple Risk Factor Intervention Trial and detected no seasonality for testosterone.
measurementSmals et al. (40) studied 15 healthy men in the United States (mean age 33.5 ± 5.9 years) and found bi-annual peaks for testosterone in summer and autumn.