Table 1.

Surveillance sequence groups after ultrashort Barrett’s esophagus on index endoscopy. Groups 1, 2 and 3 represent persistent Barrett’s esophagus cohort. Groups 4, 5 and 6 represent negative Barrett’s esophagus on surveillance.

		Surveillance Sequence	Interpretation of Sequence	N (%)
Persistent BE after USBE on Index Endoscopy	Group 1	+, +, +	Strict persistent BE (consistently detected)	44 (5.9%)
	Group 2	+, -, +	‘Persistent’ BE or potential sampling error vs recurrence on subsequent endoscopy	17 (2.3%)
	Group 3	+, +, x	Less than 3 EGDs, Strict persistent BE (consistently detected)	25 (3.4%)
Negative BE after USBE on Index Endoscopy	Group 4	+, -, -	Strict negative IM on surveillance	30 (4.1%)
	Group 5	+, +, -	‘Negative IM’ on surveillance (or potential sampling error)	22 (3.0%)
	Group 6	+, -, x	Less than 3 EGDs, ‘Negative IM’ on surveillance (or potential sampling error)	14 (1.9%)
No surveillance after USBE on Index Endoscopy	Group 7	+, x	Less than 2 EGDs	15 (2.0%)
Longer BE on Index Endoscopy	Group 8	BE segment≥1cm on IE	BE on index endoscopy	572 (77.4%)

Abbreviations: BE= Barrett’s esophagus. EGD= esophagogastroduodenoscopy. IM= intestinal metaplasia. “+” indicates the presence of BE on endoscopy and histology. “-” indicates no endoscopic BE or BE suspected endoscopically but biopsies negative for BE. “x” indicates incomplete surveillance or no biopsy.