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Table 3 Relative risk and 95% confidence interval according to mussels consumption: stratified analysis.

From: Norovirus gastroenteritis general outbreak associated with raw shellfish consumption in South Italy

  No. Exposed No. Cases Attack Rate (%) Relative Risk 95% Confidence Interval p value
eating raw mussels = "yes" (n = 80) eating cooked mussels 70 59 84.3 0.84 0.76 0.93 >0.05
eating raw mussels = "no" (n = 59) eating cooked mussels 42 30 71.4 3.04 1.26 7.30 <0.001
Summary Risk Ratio     1.38 1.00 1.91