Table A1.

Rate of Superficial Cancer by Method of Detection in Back-to-Back Fashion

Region	No. of Patients	Primary Examination WLI			Secondary Examination NBI			P
		No.	%	95% CI	No.	%	95% CI
Head and neck	13	1	8	0.2 to 36.0	10	77	46.2 to 95	< .001
Esophagus	105	58	55	45.2 to 65.0	100	95	89.2 to 98.4	< .001
		NBI			WLI
Head and neck	15	15	100	78.2 to 100	5	33	11.8 to 61.6	< .001
Esophagus	107	104	97	92 to 99.4	85	79	70.5 to 86.6	< .001

Abbreviations: WLI, white light imaging; NBI, narrow band imaging.