A comparative analysis of global Covid-19 data done in this paper in April indicated that although the pandemic was at various stages in different countries, and the public policy response was differentiated, a pattern was nevertheless discernible.
About 90 per cent of the global mortality was in the northerly latitudes, above roughly 30 degrees north. Mortality data was used for the analysis as a proxy for the spread of Covid-19, and not the infection data directly, because of the vast differences in testing across countries. We really do not know how many Covid cases are out there. Mortality data also
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