Lockdowns Seem to Have Reduced COVID-19 Cases Substantially

New York Gov. Andrew Cuomo showed this slide at his press briefing today:

At the end of March, the highest estimate for hospitalizations was 136,000+. Today the peak is estimated at about 30,000. That’s a difference of 5x. Did the modelers screw up?

Not really. Remember the Imperial College projections for the United States? They estimated about 2 million deaths if nothing was done; 1 million deaths if some countermeasures were taken; and 200,000 deaths if stringent countermeasures were taken. That’s a range of 10x. If you figure that we’ve taken fairly stringent countermeasures but not the maximum possible, then a reduction of 5x is about what you’d expect. Alternatively, if you ignore the Columbia University projection as an outlier, the IHME estimate has only gone down by about 2x. That’s what you’d expect if we took countermeasures that were just a little more stringent than their model assumed.

At the end of March it was still not clear how stringent and how effective the coronavirus countermeasures would be. In the event, it looks like they worked pretty well, cutting cases by at least 2x and possibly more. This is why the model estimates have gone down: because we followed expert advice and locked ourselves down. Just as we hoped.

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