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Table 2

Association of total testosterone with age, ethnicity, BMI, and waist circumference; regression coefficients (β)a from Generalized Estimating Equations

VariableModel 1bModel 2bModel 3b
β (ng/ml)Pβ (ng/ml)Pβ (ng/ml)P
Visit age, per yr −0.0579 0.0013 −0.0521 0.0024 −0.0433 0.012 
Black race 0.0764 0.44 0.2059 0.028 0.0493 0.62 
Year 2 BMI, per 1 kg/m2   −0.1091 <0.0001 0.0119 0.65 
Δ BMI, per 1 kg/m2   −0.1766 <0.0001 −0.1087 <0.0001 
Year 2 waist circumference, per 1 cm     −0.0544 <0.0001 
Δ waist circumference, per 1 cm     −0.0278 0.0006 
VariableModel 1bModel 2bModel 3b
β (ng/ml)Pβ (ng/ml)Pβ (ng/ml)P
Visit age, per yr −0.0579 0.0013 −0.0521 0.0024 −0.0433 0.012 
Black race 0.0764 0.44 0.2059 0.028 0.0493 0.62 
Year 2 BMI, per 1 kg/m2   −0.1091 <0.0001 0.0119 0.65 
Δ BMI, per 1 kg/m2   −0.1766 <0.0001 −0.1087 <0.0001 
Year 2 waist circumference, per 1 cm     −0.0544 <0.0001 
Δ waist circumference, per 1 cm     −0.0278 0.0006 
a

Mean change in total testosterone corresponding to the indicated difference in the independent variable.

b

Each of the models also included terms for secular changes in hormone levels between the Years 2 and 7, and the Years 2 and 10 examinations.

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