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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ATTACK RATE TABLE

FOOD ITEMS	PERSONS WHO ATE SPECIFIED FOOD				PERSONS WHO DID NOT EAT SPECIFIED FOOD				95% Confidence Interval
FOOD ITEMS	Ill	Not Ill	Total	Attack Rate	Ill	Not Ill	Total	Attack Rate	95% Confidence Interval
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.

8 years ago
01.06.2013
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