title: Withdrawal time in excellent or very poor bowel preparation qualities.
abstract: OBJECTIVE
  To evaluate association(s) between withdrawal time and polyp detection in various bowel preparation qualities.
  
  
  METHODS
  Retrospective cohort analysis of screening colonoscopies performed between January 2005 and June 2011 for patients with average risk of colorectal cancer. Exclusion criteria included patients with a personal history of adenomatous polyps or colon cancer, prior colonic resection, significant family history of colorectal cancer, screening colonoscopy after other abnormal screening tests such as flexible sigmoidoscopy or barium enema, and screening colonoscopies during in-patient care. All procedures were performed or directly supervised by gastroenterologists. Main measurements were number of colonic segments with polyps and total number of colonic polyps.
  
  
  RESULTS
  Multivariate analysis of 8331 colonoscopies showed longer withdrawal time was associated with more colonic segments with polyps in good (adjusted OR = 1.16; 95%CI: 1.13-1.19), fair (OR = 1.13; 95%CI: 1.10-1.17), and poor (OR = 1.18; 95%CI: 1.11-1.26) bowel preparation qualities. A higher number of total polyps was associated with longer withdrawal time in good (OR = 1.15; 95%CI: 1.13-1.18), fair (OR = 1.13; 95%CI: 1.10-1.16), and poor (OR = 1.20; 95%CI: 1.13-1.29) bowel preparation qualities. Longer withdrawal time was not associated with more colonic segments with polyps or greater number of colonic polyps in bowel preparations with excellent (OR = 1.07, 95%CI: 0.99-1.26; OR = 1.11, 95%CI: 0.99-1.24, respectively) and very poor (OR = 1.02, 95%CI: 0.99-1.12; OR = 1.05, 95%CI: 0.99-1.10, respectively) qualities.
  
  
  CONCLUSIONS
  Longer withdrawal time is not associated with higher polyp number detected in colonoscopies with excellent or very poor bowel preparation quality.
authors.affiliation: David Widjaja, Manoj Bhandari, Vivian Loveday-Laghi, Mariela Glandt, Bhavna Balar, Division of Gastroenterology, Department of Medicine, Bronx Lebanon Hospital Center, Bronx, NY 10456, United States.
authors.forename: David
authors.initials: D
authors.lastname: Widjaja
authors.affiliation: David Widjaja, Manoj Bhandari, Vivian Loveday-Laghi, Mariela Glandt, Bhavna Balar, Division of Gastroenterology, Department of Medicine, Bronx Lebanon Hospital Center, Bronx, NY 10456, United States.
authors.forename: Manoj
authors.initials: M
authors.lastname: Bhandari
authors.affiliation: David Widjaja, Manoj Bhandari, Vivian Loveday-Laghi, Mariela Glandt, Bhavna Balar, Division of Gastroenterology, Department of Medicine, Bronx Lebanon Hospital Center, Bronx, NY 10456, United States.
authors.forename: Vivian
authors.initials: V
authors.lastname: Loveday-Laghi
authors.affiliation: David Widjaja, Manoj Bhandari, Vivian Loveday-Laghi, Mariela Glandt, Bhavna Balar, Division of Gastroenterology, Department of Medicine, Bronx Lebanon Hospital Center, Bronx, NY 10456, United States.
authors.forename: Mariela
authors.initials: M
authors.lastname: Glandt
authors.affiliation: David Widjaja, Manoj Bhandari, Vivian Loveday-Laghi, Mariela Glandt, Bhavna Balar, Division of Gastroenterology, Department of Medicine, Bronx Lebanon Hospital Center, Bronx, NY 10456, United States.
authors.forename: Bhavna
authors.initials: B
authors.lastname: Balar
keywords: Bowel preparation quality; Polyp detection; Screening colonoscopy; Withdrawal time