Table 3.

Data on sensitivity, specificity, PPV, NPV & % misclassification as per national and international cut-offs

Cut-offs classifying treatment failures	sensitivity, specificity, PPV, NPV & % misclassification
DHSs and AISs cut-off (>200 copies/ml)	Sensitivity = 97%, specificity = 100%, PPV = 100%, NPV = 88% % misclassification (95%CI) = 2.14% (0.6%, 5.4%)
WHO cut-off (>400 copies/ml)	Sensitivity = 97%, specificity = 97%, PPV = 99%, NPV = 89% % misclassification (95%CI) = 2.67% (0.9%, 6.1%)
NACO cut-off (>1000 copies/ml)	Sensitivity = 97%, specificity = 98%, PPV = 99%, NPV = 91% % misclassification (95%CI) = 2.67% (0.9%, 6.1%)