OR for progression of CA per SD increase in cystatin C in stepwise multiple logistic regression, combined models with a cystatin C × T1D interaction term included: Model 1, cystatin C, T1D, cystatin C × T1D status; Model 2, Model 1 + age, baseline CVS, sex; Model 3, Model 2 + BMI, SBP, HDL; and Model 4, Model 3 + BMI × T1D, SBP × T1D, sex × T1D.