Table 6.

Class definition for Endoscopy and Pathology

Category	Definition
Long segment Barrett’s oesophagus	Maximum extent of Barrett’s oesophagus is equal to or exceeds 3 cm above the gastroesophageal junction4.
Short segment Barrett’s oesophagus	Maximum extent of Barrett’s oesophagus is less than 3 cm above the gastroesophageal junction.
No Barrett’s oesophagus	Absence of Barrett’s oesophagus, as explicitly stated in the report.
Insufficient	Report either lacks a clear statement regarding the presence or absence of Barrett’s oesophagus or does not provide information on the length of Barrett’s oesophagus.
No intestinal metaplasia	Presence of gastric metaplasia but does not indicate the presence of intestinal metaplasia, or explicitly states the absence of intestinal metaplasia. Dysplasia and cancer are not detected in these cases.
Intestinal metaplasia	Intestinal metaplasia is present but without any signs of dysplasia or cancer.
Dysplasia or cancer present	Dysplasia or cancer is detected in the pathology report.
Insufficient	Either no biopsies relating to an endoscopic diagnosis of Barrett’s oesophagus are available or the pathology report does not clearly indicate the nature of the sampled Barrett’s tissue.