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 FOODPERSONS WHO DID NOT EAT SPECIFIED FOOD

95% Confidence Interval

Ill

Not IllTotal

Attack Rate

IllNot IllTotalAttack Rate
Chicken36

30

6655%4303412%1.2 - 17.7
Potato Salad32407244%8202829%0.6 - 3.9
Potato Chips2042483%20567626%1.8 - 5.7
Ice Cream24024100%16607621%2.6 - 8.8
Pie3243689%8566413%2.8 - 18.0
Pepsi36407647%4202417%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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