Hazard ratios and model statistics of the shared frailty survival models (Models 3 and 4).

Estimate: estimated hazard ratios for the factors and estimated values for the model statistics (Models 3: adjusted by age, sex, public health centre district, histories of diabetes and hypertension, and body mass index; Model 4: adjusted by age, sex, public health centre district, histories of diabetes and hypertension, body mass index, smoking, alcohol intake, and regular sports habit); 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 in AIC: the subtraction of AIC of fitted model from AIC of Model 0 shown in Table 2.