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