To gain more insight in the reasons for participation and nonparticipation, which might help in the design of future information leaflets and development of information campaigns, we asked all invitees to indicate their reasons for accepting or declining the invitation in the baseline questionnaire described above. They could do so by ticking one or more of the predefined reasons for (non-)participation. In addition, they were asked to indicate the most important reason. The results are summarised in Chapter 8
. The two most reported decisive reasons to accept colonoscopy or CT-colonography screening were ‘early detection of CRC’ and ‘early detection of precursors’. In colonoscopy screening, the most indicated decisive reason for non-participation was ‘examination unpleasant’, while the most reported decisive reason to decline CT-colonography screenings was ‘no time/too much effort’, followed by ‘no symptoms, examination not necessary’. Our results indicate that future information leaflets should emphasize more on the fact that, although a subject is asymptomatic, this does not imply that there is no chance on having CRC or precursors.