Table 4. ROC analysis of the blood perfusion scores of the patients undergoing total thyroidectomy.

Location	AUC	LCI-UCI	p value	Cut-off	Sensitivity	LCI-UCI	Specificity	LCI-UCI	PPV	NPV
Left upper	1.00	0.89-1.00	< 0.0001	> 54	100.00	86.8-100.0	100.0	54.1-100.0	100.0	100.0
Left lower	0.97	0.82- 0.99	< 0.0001	> 70	90.00	73.5-97.9	100.0	29.2-100.0	100.0	50.0
Right upper	0.97	0.85-0.99	< 0.0001	> 59	93.33	77.9-99.2	100.0	29.2-100.0	100.0	60.0
Right lower	0.98	0.85-1.00	< 0.0001	> 62	96.00	79.6-99.9	100.0	54.1	100.0	85.7
Total	0.98	0.93-0.99	< 0.0001	> 62	96.40	91.1-99.0	94.44	72.7-99.9	99.1	81.0

LCI: 95% Lower Confidence Interval; UCI: 95% Upper Confidence Interval.