Figure 1. Prevalence of total diabetes at baseline and adjusted all-cause mortality RRs by age and area.

Left panel shows age-specific prevalence and the percentages in the key represent the overall age- and gender-adjusted prevalence for urban and rural regions. The size of each box is proportional to the number of participants with diabetes and the error bars indicate the 95%CI. Right panel shows adjusted all-cause mortality rate ratios (RRs) by age-at-risk in three groups (35-59, 60-69, 70-79) and area and the values in the key represent the overall, urban and rural RRs comparing those with versus without diabetes at baseline, adjusted for age, geographic area (5 within each of rural and urban region), sex, education, smoking, alcohol drinking, physical activity and BMI. Age at risk was calculated according to baseline age and length of follow-up, with censoring date by 1.1.2014 or age of death if earlier. Each RR has a CI that reflects the variance of the log risk in that one group, taking into account the variance of the log risk in the non-diabetic reference group (shown with a dotted line, with shading indicating 95% group-specific CI) and has a vertical solid line that represents the 95%CI. Mortality RRs are plotted on a floating absolute scale. Each box has an area inversely proportional to the effective variance of the log RR. The analyses were restricted to those who died at age-at-risk 35-79 years, excluding 5 deaths at age-at-risk <35 and 1014 deaths at age-at-risk ≥80 years. The point estimates on the x-axis for both panels represent the mean of each age groups, with number of individuals (left panel) and number of person-years (right panel) shown underneath the x-axis. To avoid overlap of 95%CI lines, the boxes and their 95% CIs for rural and urban areas in right panel were moved apart slightly from the actual positions.