Hazard ratios for incident metabolic syndrome according to quartiles of total testosterone, SHBG and free testosterone – results from prospective studies.

Abbreviations: BMI  =  body mass index; HOMA-IR  =  homeostasis model assessment for insulin resistance; SHBG  =  sex hormone-binding globulin; HR  =  hazard ratio; CI  =  confidence interval. Lifestyle factors: smoking, alcohol consumption and physical activity.
Model 1: adjusted for age.
Model 2: Model 1 plus lifestyle factors.
Model 3: Model 2 plus BMI.
Model 4: Model 3 HOMA-IR.