Table 2. Number of metabolically positive lymph node (MPLN) predicting N3 (n = 46).

Number of MPLN	Histological N3		Sum	Sensitivity	Specificity	PPV	NPV	Accuracy
	+	-
+ (≥ 3)	12	4	16	80%	87%	75%	90%	85%
- (0–2)	3	27	30
Total	15	31	46