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FOOD ITEMS
PERSONS WHO ATE SPECIFIED FOOD PERSONS WHO DID NOT EAT SPECIFIED FOOD 95% Confidence Interval
Ill
Not Ill Total Attack Rate
Ill Not Ill Total Attack Rate
Chicken 36 30
66 55% 4 30 34 12% 1.2 – 17.7
Potato Salad 32 40 72 44% 8 20 28 29% 0.6 – 3.9
Potato Chips 20 4 24 83% 20 56 76 26% 1.8 – 5.7
Ice Cream 24 0 24 100% 16 60 76 21% 2.6 – 8.8
Pie 32 4 36 89% 8 56 64 13% 2.8 – 18.0
Pepsi 36 40 76 47% 4 20 24 17% 0.8 – 10.5
Calculate the relative risk for each of the food items.
Identify the food items that have a statistically significant confidence interval.
Identify the food item that is the most likely source of transmission. Explain.
To identify the contaminated food item you need to identify the food items that have significant confidence intervals and pick the food with the highest relative risk. For more information, refer to "Interpretation of Odds Ratios and Relative Risk" on the Module homepage.
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