Table 2.

CT and PET validity parameters versus histology (gold standard), using lymph nodes as the study unit.

A	Biopsy +	Biopsy −	Total
CT +	70	74	144
CT −	9	50	59
Total	79	124	203
PET +	76	78	154
PET −	4	45	49
Total	80	123	203
B	Biopsy +	Biopsy −	Total
PET +	79	94	173
PET −	0	30	30
Total	79	124	203
C	CT	PET A	PET B
S	0.89	0.95	1
SP	0.40	0.37	0.24
PPV	0.49	0.49	0.46
NPV	0.85	0.92	1
Percentage agreement and p	0.207 (p < 0.001)	0.241 (p < 0.001)	0.189 (p < 0.001)

(A) Preestablished cutoff points: positive CT if short axis ≥10 mm and positive PET if SUV >2.5. (B) ROC curve cutoff points: positive CT if short axis ≥2.5 mm and positive PET if SUV >0.5. (C) Sensitivity, specificity, predictive values, and percentage agreement for each PET cutoff point.