<prompt> Positive predictive value depends on all except -SensitivitySpecificityPrevalenceIncidence  <response>: 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-prevalenceX100 