Community members who attended the Annual Neighborhood picnic earlier today are
ID: 3068705 • Letter: C
Question
Community members who attended the Annual Neighborhood picnic earlier today are experiencing illness which they believe are related to food served at the picnic. Using the table below:
Calculate the attack rate for the 1) baked ham, 2) spinach, and 3) cabbage salad. Show your work.
Which food (of the baked ham, spinach, and cabbage salad) is MOST LIKELY to have caused the illness? Discuss your answer.
Annual Neighborhood Picnic
Number of Persons Who
Number of Persons Who
Ate Specified Food
Did Not Eat Specified Food
Food
Ill
Well
Total
Ill
Well
Total
Baked Ham
29
17
46
17
12
29
Spinach
26
17
43
20
12
32
Mashed potatoes
23
14
37
23
14
37
Cabbage salad
18
10
28
28
19
47
Jello
16
7
23
30
22
52
Rolls
21
16
37
25
13
38
Brown bread
18
9
27
28
20
48
Annual Neighborhood Picnic
Number of Persons Who
Number of Persons Who
Ate Specified Food
Did Not Eat Specified Food
Food
Ill
Well
Total
Ill
Well
Total
Baked Ham
29
17
46
17
12
29
Spinach
26
17
43
20
12
32
Mashed potatoes
23
14
37
23
14
37
Cabbage salad
18
10
28
28
19
47
Jello
16
7
23
30
22
52
Rolls
21
16
37
25
13
38
Brown bread
18
9
27
28
20
48
Explanation / Answer
Attack Rate
For Exposed Group, the attack rate equals the number of people who ate item and became ill divided by the total number of people who ate that item.
For the not Exposed Group, the attack rate equals the number of people who did not eat but still became ill divided by the total number of people did not eat that item.
For finding out the item that is MOST LIKELY to have caused the illness, we need to calculate relative risk.
Relative risk is calculated by dividing the attack rate of people who were exposed to the item by attack rate of those who were not exposed to the item.
In this case, cabbage salad is MOST LIKELY to have caused the illness as it has the highest relative risk.
Food Attack Rate (For Exposed) Attack Rate (Not Exposed) Baked ham (29/46)*100 = 63.04% (17/29)*100 = 58.62% Spinach (26/43)*100 = 60.47% (20/32)*100 = 62.5% Cabbage salad (18/28)*100 = 64.29% (28/47)*100 = 59.57%Related Questions
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