Fig. 3

Country classification according to the most important risk factors and concurrent risks influencing COVID-19 CFR. a Grouping of countries into five classes based on the most important risk factors in the Omicron model. Class 1: low vaccine coverage; Class 2: ageing; Class 3: high disease burden; Class 4: low GDP; Class 5: other. b Percentage of countries with certain concurrent risks in each class of countries