Objective: To evaluate the level of informed decision making in a randomized controlled trial comparing colonoscopy and CT-colonography for colorectal cancer screening. Methods: 8844 citizens aged 50-75 were randomly invited to colonoscopy (. n=. 5924) or CT-colonography (. n=. 2920) screening. All invitees received an information leaflet. Screenees received a questionnaire within 4 weeks before the planned examination, non-screenees 4 weeks after the invitation. A decision was categorized as informed when characterized by sufficient decision-relevant knowledge and consistent with personal attitudes toward participation in screening. Results: Knowledge and attitude items were completed by 1032/1276 colonoscopy screenees (81%), by 698/4648 colonoscopy non-screenees (15%), by 824/982 CT-colonography screenees (84%) and by 192/1938 CT-colonography non-screenees (10%). 1027 colonoscopy screenees (>99%) and 815 CT-colonography screenees (99%) had adequate knowledge; 915 (89%) and 742 (90%) had a positive attitude. 675 non-screenees invited to colonoscopy (97%) and 182 invited to CT-colonography (95%) had adequate knowledge; 344 (49%) and 94 (49%) expressed a negative attitude. Conclusion: A large majority of screenees made an informed decision on participation. Almost half of responding non-screenees, made an uninformed decision, suggesting additional barriers to participation. Practice implications: Efforts to understand the additional barriers will create opportunities to facilitate informed participation to colorectal cancer screening.

CT Colonography, Colonoscopy, Colorectal cancer, Informed decision making, Screening
dx.doi.org/10.1016/j.pec.2013.01.004, hdl.handle.net/1765/40051
Patient Education and Counseling
Erasmus MC: University Medical Center Rotterdam

de Haan, M.C, de Wijkerslooth, T.R, Stoop, E, Bossuyt, P.M.M, Fockens, P, Thomeer, M.G.J, … Stoker, J. (2013). Informed decision-making in colorectal cancer screening using colonoscopy or CT-colonography. Patient Education and Counseling, 91(3), 318–325. doi:10.1016/j.pec.2013.01.004