The global CFR exhibited a decreasing trend from January 2020 to January 2022, with respective values of 2.26%, 1.95%, 1.92%, and 0.74% for the original, Alpha, Delta, and Omicron periods (Fig. 1 a, b).
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Country-specific determinants for COVID-19 case fatality rate and response strategies from a global perspective: an interpretable machine learning framework.
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