title: Withdrawal times affects polyp and diverticulum detection on the right-side colon.
abstract: OBJECTIVE
  We aimed to investigate the association between colorectal polyp detection rates and withdrawal times, and also to investigate diverticulum detection rates as a counterpart lesion.
  
  
  METHODS
  Thirteen trainee colonoscopists were characterized by their mean withdrawal time for normal colon. A total of 2,314 colonoscopies were analyzed.
  
  
  RESULTS
  The mean withdrawal times ranged from 6.5 to 10.4 minutes among colonoscopists. Polyp detection rates in individual endoscopists ranged between 36.5% and 60.0%. When stratified by the hood use, a significant association was shown when the hood was not used (p=0.03), whereas no association was found when the hood used. On the other hand, diverticulum detection rates varied from 20.7% to 43.2%. A strong association was shown only when the hood was not used (p=0.009).
  
  
  CONCLUSIONS
  An association between the polyp or diverticulum detection rate and the withdrawal time was observed when the transparent hood was not attached, and mainly on the right-side colon.
authors.affiliation: Department of Gastroenterology, University of Tokyo, Tokyo, Japan. kaji-kaji@umin.net
authors.forename: Haruka
authors.initials: H
authors.lastname: Kajiwara
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Yamaji
authors.forename: Takafumi
authors.initials: T
authors.lastname: Sugimoto
authors.forename: Atsuo
authors.initials: A
authors.lastname: Yamada
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Watabe
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Yoshida
authors.forename: Masao
authors.initials: M
authors.lastname: Omata
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Koike
mesh_terms: D000368:Aged; D002983:Clinical Competence; D003111:Colonic Polyps / Q000473:pathology*; D020685:Colonoscopes; D003113:Colonoscopy / Q000295:instrumentation; D004241:Diverticulum, Colon / Q000473:pathology*; D004867:Equipment Design; D005260:Female; D006801:Humans; D007417:Intestinal Polyps / Q000473:pathology*; D007564:Japan; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012002:Rectal Diseases / Q000473:pathology*; D012189:Retrospective Studies; D013997:Time Factors