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Background/Aims: Interobserver variation by experiencewas documented for the diagnosis of esophagitis usingthe Los Angeles classification. The aim of this study was toevaluate whether interobserver agreement can be improvedby higher levels of endoscopic experience in the diagnosisof erosive esophagitis. Methods: Endoscopic images of51 patients with gastroesophageal reflux disease (GERD)symptoms were obtained with conventional endoscopy andoptimal band imaging (OBI). Endoscopists were divided intoan expert group (16 gastroenterologic endoscopic specialistsguaranteed by the Korean Society of GastrointestinalEndoscopy) and a trainee group (individuals with fellowships,first year of specialty training in gastroenterology). Allendoscopists had no or minimal experience with OBI. GERDwas diagnosed using the Los Angeles classification with orwithout OBI. Results: The mean weighted paired κ statisticsfor interobserver agreement in grading erosive esophagitisby conventional endoscopy in the expert group was betterthan that in the trainee group (0.51 vs 0.42, p<0.05). Themean weighted paired k statistics in the expert group and inthe trainee group based on conventional endoscopy with OBIdid not differ (0.42, 0.42). Conclusions: Interobserver agreementin the expert group using conventional endoscopy wasbetter than that in the trainee group. Endoscopic experiencecan improve the interobserver agreement in the grading ofesophagitis using the Los Angeles classification.

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