Low-dose spectral insufflation computed tomography protocol preoperatively optimized for T stage esophageal cancer - preliminary research experience

Table 5 Accuracy of T stage comparisons between groups

Stage	Group	n	TP	TN	FP	FN	Sensitivity (%)	Specificity (%)	Accuracy (%)	PPV (%)	NPV (%)
	A	45	7	9	15	14	31.82	60.87	46.67	43.75	48.28
T1/2	B	40	5	9	10	16	33.33	64.00	52.50	35.71	61.54
	C	35	7	7	9	12	43.75	63.16	54.29	50.00	57.14
	A	45	7	9	10	19	41.17	67.86	57.78	43.75	65.52
T3	B	40	8	8	10	14	44.44	63.64	55.00	50.00	58.33
	C	35	9	5	7	14	56.25	73.68	65.71	60.00	66.67
	A	45	5	12	1	27	83.33	69.23	71.11	29.41	96.43
T4	B	40	6	10	1	23	85.71	69.70	72.50	37.50	95.83
	C	35	11	7	2	15	84.62	68.18	74.29	61.11	94.12

TP: True positive; TN: True negative; FP: False positive; FN: False negative; PPV: Positive predictive value; NPV: Negative predictive value.