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Table 4 Comparison of attack rates and secondary attack rates in clusters before and after February 02, 2020a

From: Epidemiological analysis of 67 local COVID-19 clusters in Sichuan Province, China

Time No. of cases No. of exposed persons Attack rate (%) p value No. of secondary cases No. of exposed persons Secondary attack rate (%) p value
Before February 02, 2020 156 2027 7.70 0.022 107 1990 5.38 0.022
After February 02, 2020 111 1100 10.09 80 1072 7.46
  1. aBoth the number of cases and the number of secondary cases include confirmed cases and asymptomatic carriers