Table 5.

Area under the curve (AUC), cutoff value, and diagnostic tests according to atrial fibrillation groups.

Test results	AUC	Standard error	P-value	Cutoff	Sensitivity	Specificity	95% Confidence interval
Variables							Lower	Upper
Preoperative QT	0.728	0.057	0.001	419	0.703	0.692	0.617	0.839
Preoperative QTc	0.814	0.057	0.001	434.5	0.784	0.869	0.703	0.925
Postoperative QT	0.651	0.056	0.005	423.5	0.595	0.585	0.541	0.76
Postoperative QTc	0.845	0.051	0.001	431	0.811	0.885	0.744	0.945

QTc=corrected QT interval