Endoscopic ultrasonography for staging of T1a and T1b esophageal squamous cell carcinoma

Table 3 Accuracy of endoscopic ultrasound for staging T1a or T1b esophageal squamous cell carcinoma in relation to tumor location

Site of neoplasm		Expert 1		Expert 2		Common results
		T1a	T1b	T1a	T1b	T1a	T1b
Upper third	T1a	4	2	4	2	4	1
	T1b	1	2	1	2	1	3
Mid third	T1a	14	10	16	11	17	8
	T1b	9	19	7	18	6	21
Lower third	T1a	5	1	5	1	5	1
	T1b	2	3	2	3	2	3
Group
AC	Upper third	66.7%		66.7%		77.8%
	Mid third	63.50%		65.40%		73.10%
	Lower third	72.70%		72.70%		72.70%
SE	Upper third	66.70%		66.70%		80.00%
	Mid third	58.30%		59.30%		68.00%
	Lower third	83.30%		83.30%		83.30%
FPR	Upper third	66.70%		66.70%		75.00%
	Mid third	67.90%		72.00%		77.80%
	Lower third	60.00%		60.00%		60.00%
FNR	Upper third	80.00%		80.00%		80.00%
	Mid third	60.90%		69.60%		73.90%
	Lower third	71.40%		71.40%		71.40%
SP	Upper third	50.00%		50.00%		75.30%
	Mid third	65.50%		62.10%		72.40%
	Lower third	75.00%		75.00%		75.00%

AC: Accuracy; SE: Sensitivity; FPR: False positive rate; FNR: False negative rate; SP: Specificity.