dr_singh246
internal medicine pgy2
Topics: 235
Posts: 561
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1. What is the effect of increased prevalence on sensitivity? On positive predictive value?
2. What is the effect of increased incidence on sensitivity? On positive predictive value?
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| mjl1717
Forum Hero
Topics: 955
Posts: 5,451
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1) As prevalence increases PPV increases but NPV decreases
2)In general sensitivity and specificity do not change according to the context that the test are used.
3)I think the big thing is: Are you testing the general population or a "high risk group"
4)PPV of a test can be improved by limiting its use to a high risk population
Comments ?
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| xfwang2002
Forum Junior
Topics: 8
Posts: 47
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very clear and precise.
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