13-year colorectal cancer risk after lower-quality, higher-quality and no screening colonoscopy: a cohort study

A lower-quality colonoscopy has been shown to be less effective in reducing colorectal cancer (CRC) incidence than a higher-quality colonoscopy, but the comparison with no screening colonoscopy is lacking. We aimed to compare the 13-year risk of developing CRC between persons with I) a higher-quality screening colonoscopy, II) a lower-quality screening colonoscopy and III) without a screening colonoscopy.