Regression of γ-GT and smoking, by body mass index category.

aAll models adjusted for age, alcohol consumption, and BMI category; 'fully adjusted' models additionally adjusted for nationality, occupational group, prevalent diabetes, prevalent ischemic heart disease, prevalent hypertension.
bP-values refer to a 2 degrees of freedom Wald test for the significance of an interaction term of the smoking trend variable with the BMI category.
Results of trend modelsa estimating the effects of smoking on serum γ-GT levels nested in BMI strata.