highly significantp < 0.01
All epidemiologic measures gradually increase in parallel with SDI, and a highly significant exponential correlation can also be found between SDI rank and incidence ( r = 0.993; p < 0.01), prevalence ( r = 0.986; p < 0.01), DALYs ( r = 0.999; p < 0.01) and mortality ( r = 0.996; p < 0.01).