<prompt> Predictive value indicating positive test in a screening modality is calculated by:TPTPFP100TNTNFN 100TPTPFN100TNFPTN100  <response>: Ans. a TPTPFP100SENSITIVITYTP---TP FNx 100PREDICTIVE VALU OF A NEGATIVE TESTTN---TNFNx 100SPECIFICITYTP---FP TNx 100 OF FALSE NEGATIVESFN---TP FNx 100PREDICTIVE VALU OF A POSITIVE TESTTP---TP FPx 100 OF FALSE POSITIVESTN---FP TNx 100 