Table 5.

Contingency table for PET-CT in identifying lymph node metastases in AC group

	Criterion 1			Criterion 2
	Pathological LN positive(+)	Pathological LN negative(−)	Total	Pathological LN positive(+)	Pathological LN negative(−)	Total
PET-CT(+)	46	10	56	32*	9	41
PET-CT(−)	34	232	266	48	233	281
Total	80	242	322	80	242	322

Criterion 1: Sensitivity: 57.5%; Specificity: 95.9%; Accuracy: 86.3%.

Criterion 2: Sensitivity: 40.0%*; Specificity: 96.3%; Accuracy: 82.3%.

*Means the difference in the sensitivity was significant (P < 0.01) between criterion 1 and criterion 2 in AC group.