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Table 1 Daily attack rates and risk ratios of gastroenteritis among students having meals on high-risk stalls of the school canteen, September 1–5

From: A foodborne outbreak of gastroenteritis caused by Norovirus and Bacillus cereus at a university in the Shunyi District of Beijing, China 2018: a retrospective cohort study

Date High-risk stalls Exposed Non-exposed  
Total Cases AR% Total Cases AR% RR 95% CI P
September 1 Drinks 299 13 4.3 777 10 1.3 3.4 1.5–7.8 0.002
Rice flour 48 6 12.5 1028 17 1.7 7.6 2.8–20.2 0.000
September 2 Rice flour 53 3 5.7 1826 26 1.4 4.0 1.2–13.6 0.046
Fish meal 81 5 6.2 1798 24 1.3 4.6 1.7–12.5 0.003
September 4 Muslim meal 152 9 5.9 3468 77 2.2 2.7 1.3–5.4 0.008
September 5 Barbeque 152 6 3.9 3059 41 1.3 3.0 1.2–7.0 0.023
  1. AR attack rate, RR risk ratio, CI confidence interval