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Table 2 Mean date of NPI announcement with state case prevalence quartile on day of announcement

From: Survival analysis of factors affecting the timing of COVID-19 non-pharmaceutical interventions by U.S. universities

Case prevalence quartile Move online Cancel travel Campus housing Close campus Remote work
Mean date NPI announced | Variance in days
 Q1 Mar-11 | 1 Mar-06 | 3 Mar-11 | 1 Mar-16 | 2 Mar-14 | 2
 Q2 Mar-11 | 1 Mar-10 | 2 Mar-12 | 2 Mar-19 | 3 Mar-15 | 2
 Q3 Mar-12 | 2 Mar-11 | 2 Mar-15 | 3 Mar-20 | 3 Mar-16 | 3
 Q4 Mar-11 | 2 Mar-13 | 4 Mar-17 | 3 Mar-21 | 4 Mar-17 | 4
Total Mar-11 | 2 Mar-10 | 4 Mar-14 | 3 Mar-19 | 4 Mar-15 | 3
Number of positive cases in state on day of decision | Variance in cases
 Q1 3 | 2 0 | 0 4 | 3 32 | 18 150 | 327
 Q2 12 | 4 5 | 2 20 | 5 157 | 63 451 | 1189
 Q3 37 | 19 21 | 8 72 | 42 471 | 126 748 | 2048
 Q4 339 | 382 800 | 1746 1633 | 4031 3561 | 4322 2853 | 4118
Total 97 | 236 206 | 934 430 | 2122 1042 | 2586 1052 | 2602