Role of computed tomographic colonoscopy of postoperative surveillance in patient with gastric cancer

Table 4 Ability of virtual colonosocpy to identify patients with colorectal polyps or masses according to lesion in CT colonoscopy group

	TP (n)	TN (n)	FP (n)	FN (n)	Sensitivity	Specificity	PPV	NPV
≥ 1 mm	8	24	9	6	57.10%	72.70%	47.10%	80.00%
≥ 6 mm	4	39	3	1	80.00%	92.90%	57.10%	97.50%

TP: true positive, TN: true negative, FP: false negative, FN: false negative, PPV: positive predictive value, NPV: negative predictive value.