Sa1639 Impact of Bowel Preparation Quality on Detection of Non-Polypoid Colorectal Neoplasms and Their Prevalence in Average-Risk Screening Colonoscopy

Abstract

family history, colonoscopy history, or withdrawal time of colonoscopy; prior history of invasive CRC, inflammatory bowel disease, or familial adenomatous polyposis. Patients who had undergone colonoscopy performed by a colonoscopist who had experience with!30 colonoscopies during the study period were also excluded. Colonoscopists who participated in the study were divided into following 3 groups, based on median withdrawal time of negative colonoscopy:!6 min (group A); 6-9 min (group B); and R10 min (group C). We analyzed the relationship between the withdrawal time group and adenoma detection rate using multiple logistic regression. The odds ratios were adjusted according to age, sex, past history of CRC, family history of CRC, past history of colonoscopy, and whether or not a distal attachment was used. Results: The final analysis included 4988 patients. Compared with group A, the odds ratios for detection of any adenoma or cancer by colonoscopists in group B, and group C were 1.53 (95% confidence interval [CI], 1.15-2.04) and 1.95 (95% CI, 1.45-2.63), respectively. For detection of advanced neoplasia, the respective odds ratios were 1.61 (95% CI, 0.95-2.73) and 1.97 (95% CI, 1.15-3.37). Conclusions: The results of this study suggest that a colonoscopy withdrawal time of over 6 min would be a useful quality indicator of colonoscopy in the Japanese setting. Relationship between colonoscopist groups and adenoma detection rates