The number of people with diabetes in each of the seven IDF Regions and each World Bank income classification was then calculated by aggregating the number of people with diabetes from each country within the respective IDF Region and World Bank income classification, separately for diabetes prevalence and for comparative diabetes prevalence and dividing by the region/group total population 20–79 years of age. Global estimates were similarly calculated by summing the total number of people with diabetes from each country and dividing by the total estimated UN world population 20–79 years of age for 2021.
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