Cutoff points Sensitivity Specificity PPV NPV >20.2 97.3 48.2 80.5 95.2 >22.5 98.1 53.3 86.5 98.3 >24.2 98.7 80.4 93.7 98.5 >27.5 99.1 93.3 97.8 99.8 >30.7 95.5 98.5 98.3 88.2 >33.2 93.3 98.9 99.1 83.3

Table 3: Sensitivity, Specificity, PPV, and NPV of anti-MCV in RA patients at different points of cut-off, value of >27.5 represents the highest sensitivity of anti MCV test.