Diagnostic power of the test is reflected by:
Diagnostic power of a screening test: Predictive accuracy (it tells the actual no. of people having the disease or not having the disease out of those shown positive or negative by a screening test) Diagnostic power of a screening test to correctly identify disease: positive predictive value (PPV) Diagnostic power of a screening test to correctly exclude a disease: negative predictive value (NPV)
Sensitivity
Specificity
Predictive value
Population attributable risk
Definition and Concepts, Examples from NHPs