Positive predictive value depends on all except –
Correct Answer: Incidence
Description: Ans. is 'd' i.e., Incidence o Positive predictive value (PPV) of a screening test depends on : -SensitivitySpecificityPrevalence of diseaseo As the sensitivity and specificity of a test are relatively constant, positive predictive value is mainly dependent on the prevelance of disease.PPV =Sensitivity x Prevalence------------------------(sensitivity x prevalence) + (100-spcificity) (100-prevalence)X100
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Social & Preventive Medicine
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