Effect of Body Mass Index on Cecal Intubation Time During Unsedated Colonoscopy: Variation Across the Learning Stages of an Endoscopist.

BACKGROUND Body mass index (BMI) and endoscopists' experiences can be associated with cecal intubation time (CIT), but such associations are controversial. This study aimed to clarify the association between BMI and CIT during unsedated colonoscopy at 3 learning stages of a single endoscopist. MATERIAL AND METHODS A total of 1500 consecutive patients undergoing unsedated colonoscopy by 1 endoscopist at our department from December 11, 2020, to August 21, 2022, were reviewed. They were divided into 3 learning stages according to the number of colonoscopies performed by 1 endoscopist, including intermediate (501-1000 colonoscopies), experienced (1001-1500 colonoscopies), and senior stages (1501-2000 colonoscopies). Variables that significantly correlated with CIT were identified by Spearman rank correlation analyses and then included in multiple linear regression analysis. RESULTS Overall, 1233 patients were included. Among them, 392, 420, and 421 patients were divided into intermediate, experienced, and senior stages, respectively. Median CIT was 7.83, 6.38, and 5.58 min at intermediate, experienced, and senior stages, respectively (P.