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Cross-sectional study
Number needed to screen to detect adenomas, advanced adenomas and colorectal cancer is higher in women than in similarly aged men
  1. Carol A Burke
  1. Cleveland Clinic, Gastroenterology and Hepatology, Cleveland, Ohio, USA
  1. Correspondence to Carol A Burke
    Department of Gastroenterology and Hepatology, Cleveland Clinic, Desk A31, 9500 Euclid Ave, Cleveland, OH 44195, USA; burkec1{at}

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A total of 1.2 million cases of colorectal cancer (CRC) and nearly 609 000 related deaths will occur worldwide this year.1 CRC screening decreases CRC incidence and mortality.2 Unfortunately, colonoscopy has been shown to be less effective in CRC control than previously considered3 and CRC occurs in up to 9% of individuals undergoing colonoscopy in the preceding 9 years4. Factors associated with interval CRC include lower completion and polypectomy rates.

Colonoscopy is often considered the preferred CRC screening test. Many countries including Austria recommend initiating screening colonoscopy in average risk individuals at age 50, one decade earlier than the typical onset of …

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  • Competing interests None.