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New York City’s Public Health Response Time was -11 days and the weekly Excess Death Rate was 0/100 000, when lockdown measures were implemented. Its first case was on the 5^th of September and it implemented lockdown measures on the 18^th of September (relatively early lockdown in relation to its first case and first flu death). It employed 73 days of lockdown measures (relatively long lockdown period) and the time to peak was 35 days (which is a relatively long delay in peaking) and the magnitude of the peak excess death rate was 90/100 000 (relatively low peak).

Data sourced from: Public Health Reports, Vol 45, No 39, September 26, 1930

In the middle of September, New York City made influenza and pneumonia reportable and resolved that an epidemic existed. The lockdown measures implemented from September through to November, caused the steep decline in mortality.