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In short, the effects, or manageability, of Covid-19 seems to correlate pretty strongly with population density.
It does seem to be true. Using data as of yesterday (from Worldometers
) for 50 US states, and plotting against the population density by land area (excluding lakes and rivers), and doing a simple linear regression, I find a positive correlation coefficient of about 0.4115, which for 50 data points has a confidence level of 99.7%.
Plotting the same thing again but as deaths per 1 million residents vs. density yields a significantly stronger trend:
One caveat to this however is that the most population dense regions of the US are mostly the coastal states, especially in the northeast, which were also the first to be impacted due to the location of major transport hubs. So there could be a correlation to density not because of causation, but correlation to where the epidemic strikes first, whereas areas hit later have the benefit of better testing, tracing, and treatments to reduce the number of deaths. That being said, I still do think that population density is likely to be an important factor.