Using a computer software program, the epidemiologists have analyzed the food history data from the questionnaires and have constructed the following attack rate table.

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Using a computer software program, the epidemiologists have analyzed the food history data from the questionnaires and have constructed the following attack rate table.  

ATTACK RATE TABLE

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.

 

 

Assignment Expectations, in order to earn full credit:

Please write your paper in your own words. That is the only way I can evaluate your level of understanding. Quotes are rarely needed; if necessary, they should comprise less than 10% of a paper and must be properly cited.

 

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