GPX1 and coronary artery disorder: According to ROC given in vessel score the AUC for GPX-1 was 0.93 with a detectable cutoff value of 23.9 U/gHb keeping acceptable sensitivity (97 %), PPV and NPV of 74 % and 96 % respectively suggesting that GPX-1 appeared to be an important predictive marker of ruling out CAD in present study population (Table 5).