A case-control study investigated whether ovarian cancer was associated with exp
ID: 3234052 • Letter: A
Question
A case-control study investigated whether ovarian cancer was associated with exposure to asbestos. Because ovarian cancer risk increases with age, each case (woman with ovarian cancer) was individually matched to a control (woman without ovarian cancer) of the same age. Exposure status to asbestos was assessed for each woman. The results:
For 111 matched pairs of women: neither case nor control reported prior exposure to asbestos
For 41 matched pairs of women: both participants reported prior exposure to asbestos.
For 8 matched pairs of women: only the control participant reported exposure to asbestos.
For 59 matched pairs of women: only the case participant reported exposure to asbestos.
A case-control study investigated whether ovarian cancer was associated with exposure to asbestos. Because ovarian cancer risk increases with age, each case (woman with ovarian cancer) was individually matched to a control (woman without ovarian cancer) of the same age. Exposure status to asbestos was assessed for each woman. The results were:
For 111 matched pairs of women: neither case nor control reported prior exposure to asbestos
For 41 matched pairs of women: both participants reported prior exposure to asbestos.
For 8 matched pairs of women: only the control participant reported exposure to asbestos.
For 59 matched pairs of women: only the case participant reported exposure to asbestos.
Fill in the table below from the results above.
Control Participant
Case Participant
Asbestos Exposure
No Asbestos Exposure
Asbestos Exposure
A
B
No Asbestos Exposure
C
D
Control Participant
Case Participant
Asbestos Exposure
No Asbestos Exposure
Asbestos Exposure
A
B
No Asbestos Exposure
C
D
Explanation / Answer
From the given details,
A = 111
B = 8
C = 59
D = 41
Hence,
The table will be:
Control Participant
Case Participant
Asbestos Exposure
No Asbestos Exposure
Asbestos Exposure
111
8
No Asbestos Exposure
59
41
Control Participant
Case Participant
Asbestos Exposure
No Asbestos Exposure
Asbestos Exposure
111
8
No Asbestos Exposure
59
41
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