AK84

Sensitivity, Specificity, PPV, NPV

2 posts in this topic

The definitions of these 4 seem to overlap quite a lot making it confusing to pick out the right one in an MCQ.

Anyone know how to properly differentiate between them

 

Notably - Specificity and NPV have a similar definition and likewise Sensitivity and PPV have a similar one as well

 

thanks

Edited by AK84

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I remember them this way and I think it's easier to understand.

Sensitivity (e.g. of a screening test)

Among those with the disease, how many will be correctly screened as positive?

Specificity

Among those without the disease, how many will be correctly screened as negative?

Positive Predictive Value

Among those who were screened positive, how many actually have the disease?

Negative Predictive Value

Among those who were screened negative, how many actually don't have the disease?

 

Hope this helps :D

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