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Seasonal variation of participation in colorectal neoplasia screening by colonoscopy or ct colonography

Population-based colorectal neoplasia (CRN) screening has received widespread endorsement by professional bodies. Screening test recommendations vary by country and include faecal occult blood testing (FOBT), flexible sigmoidoscopy (FS), colonoscopy, double-contrast barium enema or a combination.1-3 Participation in a screening program is a determinant of both the potential public health benefit of the program as well as the costeffectiveness of any colon cancer-screening test.4,5 Participation in CRN screening trials ranges from between 23-77%, depending on the screening modality and method of recruitment.6,7 Socioeconomic status, health care coverage, level of education, age and gender are demographic factors that have been shown to influence participation in colorectal screening.8 Our studies evaluating CRN screening by colonoscopy or CTC found higher participation in those from a higher socio-economic Table 1: Distribution of response to invitation by season.