A new screening test for allergy was developed and tested with 400 children of w
ID: 3323541 • Letter: A
Question
A new screening test for allergy was developed and tested with 400 children of whom 100 had a previously confirmed allergy and 300 had no prior history of allergy. The results were as follows:
Allergy History (Gold Standard)
Yes
No
Test
Result
Positive
60
20
Negative
40
280
If the prevalence of the disease in this sample of 400 children increases by 50%, what will be the most likely outcome:
The sensitivity of the test will increase by 50%
The specificity of the test will increase by 50%
The predictive value positive will increase
The predictive value positive will decrease
The predictive value positive will stay the same
Allergy History (Gold Standard)
Yes
No
Test
Result
Positive
60
20
Negative
40
280
Explanation / Answer
as we increase prevalence (cause sensitivity and specificity are inherent property of test they will not change) but number of true postiive among total true postiive will increase.
hence
The predictive value positive will increase
C.The predictive value positive will increase
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