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Table 4

Association of free 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 −0.0030 <0.0001 −0.0030 <0.0001 −0.0029 <0.0001 
Black race 0.0035 0.18 0.0049 0.068 0.0033 0.23 
Year 2 BMI, per 1 kg/m2   −0.0008 0.014 0.0005 0.47 
Δ BMI, per 1 kg/m2   −0.0016 0.0046 −0.001 0.19 
Year 2 waist circumference, per 1 cm     −0.0005 0.063 
Δ Waist circumference, per 1 cm     −0.0002 0.32 
VariableModel 1bModel 2bModel 3b
β (ng/ml)Pβ (ng/ml)Pβ (ng/ml)P
Visit age, per yr −0.0030 <0.0001 −0.0030 <0.0001 −0.0029 <0.0001 
Black race 0.0035 0.18 0.0049 0.068 0.0033 0.23 
Year 2 BMI, per 1 kg/m2   −0.0008 0.014 0.0005 0.47 
Δ BMI, per 1 kg/m2   −0.0016 0.0046 −0.001 0.19 
Year 2 waist circumference, per 1 cm     −0.0005 0.063 
Δ Waist circumference, per 1 cm     −0.0002 0.32 
a

Mean change in free 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 Year 2 and 7, and the Years 2 and 10 examinations.

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