Question
The 58th annual convention of the American Legion was held Philadelphia from July 21 until July 24, 1976. People at the convention included American Legion delegates, their families, and other Legionnaires who were not official delegates. Between July 20 and August 30, some of those who had been present became ill with type of pneumonia that was subsequently named Legionnaires' disease. No one attending the convention developed the disease after August 30. The numbers of delegates and non-delegates who developed Legionnaires' disease during the period July 20 to August 30 (a 41-day period) are as follows:
Developed Legionnaire’s disease
| |||
Convention status
|
Yes
|
No
|
Total
|
Delegate
|
125
|
1724
|
1849
|
Non-delegate
|
3
|
759
|
762
|
A. Compute the cumulative incidence of Legionnaires' disease among delegates and nondelegates.
B. Calculate the cumulative incidence ratio of Legionnaires' disease among delegates compared with nondelegates.
C. State in words the meaning of this measure.
D. Calculate the cumulative incidence difference of Legionnaires' disease among delegates compared with nondelegates.
E. State in words the meaning of this measure.
F. Calculate the attributable proportion of Legionnaires' disease among the delegates.
G. State in words the meaning of this measure.
