Characteristics of study sample.

n/a = not applicable.a. Based on data from n = 768 respondents of which 429 women and 336 men (due to missing values), columns do not necessarily add to 768.b. Multiple answers were possible.c. Significantly more patients with the indication ‘surveillance for colonoscopy for hereditary colon carcinoma/polyposis/polyps’ were seen in the tertiary center (41.3%) compared to the general teaching hospital (23.6%; pd. Under which: loss of weight, diarrhea, eating disorders etc.