title: The association of colonoscopy quality indicators with the detection of screen-relevant lesions, adverse events, and postcolonoscopy cancers in an asymptomatic Canadian colorectal cancer screening population.
abstract: BACKGROUND
  Although several quality indicators of colonoscopy have been defined, quality assurance activities should be directed at the measurement of quality indicators that are predictive of key screening colonoscopy outcomes.
  
  
  OBJECTIVE
  The goal of this study was to examine the association among established quality indicators and the detection of screen-relevant lesions (SRLs), adverse events, and postcolonoscopy cancers.
  
  
  METHODS
  Historical cohort study.
  
  
  METHODS
  Canadian colorectal cancer screening center.
  
  
  METHODS
  A total of 18,456 asymptomatic men and women ages 40 to 74, at either average risk or increased risk for colorectal cancer because of a family history, who underwent a screening colonoscopy from 2008 to 2010.
  
  
  METHODS
  Using univariate and multivariate analyses, we explored the association among procedural quality indicators and 3 colonoscopy outcomes: detection of SRLs, adverse events, and postcolonoscopy cancers.
  
  
  RESULTS
  The crude rates of SRLs, adverse events, and postcolonoscopy cancers were 240, 6.44, and .54 per 1000 colonoscopies, respectively. Several indicators, including endoscopist withdrawal time (OR, 1.3; 95% CI, 1.2-1.4) and cecal intubation rate (OR, 13.9; 95% CI, 1.9-96.9), were associated with the detection of SRLs. No quality indicator was associated with the risk of adverse events. Endoscopist average withdrawal time over 6 minutes (OR, .12; 95% CI, .002-.85) and SRL detection rate over 20% (OR, .17; 95% CI, .03-.74) were associated with a reduced risk of postcolonoscopy cancers.
  
  
  CONCLUSIONS
  Single-center study.
  
  
  CONCLUSIONS
  Quality assurance programs should prioritize the measurement of endoscopist average withdrawal time and adenoma (SRL) detection rate.
authors.affiliation: Department of Medicine, University of Calgary, Calgary, Alberta, Canada.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Hilsden
authors.affiliation: Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: Catherine
authors.initials: C
authors.lastname: Dube
authors.affiliation: Department of Medicine, University of Calgary, Calgary, Alberta, Canada.
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Heitman
authors.affiliation: Department of Medicine, University of Calgary, Calgary, Alberta, Canada.
authors.forename: Ronald
authors.initials: R
authors.lastname: Bridges
authors.affiliation: Alberta Health Services-Population, Public & Aboriginal Health, Calgary, Alberta, Canada.
authors.forename: S Elizabeth
authors.initials: SE
authors.lastname: McGregor
authors.affiliation: Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada.
authors.forename: Alaa
authors.initials: A
authors.lastname: Rostom
mesh_terms: D000328:Adult; D000368:Aged; D002170:Canada / Q000453:epidemiology; D003113:Colonoscopy / Q000592:standards*; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000453:epidemiology; D055088:Early Detection of Cancer / Q000592:standards*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000592:standards*; D008875:Middle Aged; D009017:Morbidity / Q000639:trends; D011379:Prognosis; D019984:Quality Indicators, Health Care