Fig 2. The association between total percent fat (%) and testosterone (ng/dL).

(a) Each black point represents a sample. (b) Solid red line represents the smooth curve fit between variables. Blue bands represent the 95% confidence bands derived from the fit. (c) Stratified by sex. Age, sex, race, hypertension, diabetes, hypercholesteremia, smoking status, vigorous work activity were adjusted (c was not sex-adjusted).