Hazard ratios and model statistics of the shared frailty survival model with the interaction terms of the two areal factors (Model 5A).

Estimate: estimate hazard ratios for the factors and estimated values for the model statistics (Model 5A: adjusted by age, sex, public health centre district, histories of diabetes and hypertension, and body mass index); Qs = Quartiles, CI = confidence interval; trend p: p value of trend test; Explained geographical variance: percentage of reduction in Theta of fitted models compared to Model 0 shown in Table 2; Difference of AIC: the subtraction of the AIC of the fitted model from the AIC of Model 0 shown in Table 2.