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Table 2 Attack rates, relative risk, confidence intervals and chi-squared p value according to exposure.

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

Exposure No. Exposed No. Cases (n = 103) Attack Rate (%) Relative Risk 95% Confidence Interval p value
raw mussels 80 69 86.3 1.50 1.18 1.89 <0.001
cooked mussels 112 89 79.5 1.53 1.05 2.23 0.003
eggs 16 13 81.3 1.10 0.85 1.43 >0.05
oven cooked pasta 62 43 69.4 0.89 0.73 1.09 >0.05
grilled sausage 51 36 70.6 0.93 0.75 1.15 >0.05
grilled meat 89 65 73.0 0.96 0.79 1.17 >0.05
grilled lamb 70 52 74.3 1.01 0.83 1.22 >0.05
dairy milk products 77 54 70.1 0.89 0.73 1.08 >0.05
cheese 49 35 71.4 0.93 0.76 1.15 >0.05
fresh vegetables 85 65 76.5 1.09 0.88 1.34 >0.05
pastries 53 40 75.5 1.03 0.84 1.26 >0.05