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The age structure of affected population should be also accounted for a fair comparison. In Korea, the low CFR, 1.3% as of March 25, 2020, could have resulted from the larger proportion of younger confirmed cases resulting larger denominator of low-risk population. Difference in age structure of affected population between countries may guide to the true burden of COVID-19 in terms of disease severity and fatality proportions. Age-specific or agestratified CFR will be useful in comparing between the countries with different affected age groups. Table 1 shows number of deaths and age-specific CFRs of Korea, Italy, and China. 2, 5 Crude CFR in Korea appears to be one fifth lower than that of Italy (1.3% vs. 7.2%), but the

2/3 https://jkms. org https://doi. org/10.3346/jkms. 2020.35. e137