The effect of a supplementary (‘gist-based’) information leaflet on colorectal cancer knowledge and screening intention: a randomized controlled trial

摘要

Guided by Fuzzy Trace Theory, this study examined the impact of a ‘Gist-based’ leaflet on colorectal cancer screening knowledge and intentions; and tested the interaction with participants’ numerical ability. Adults aged 45–59years from four UK general practices were randomly assigned to receive standard information (‘The Facts’, n=2,216) versus standard information plus ‘The Gist’ leaflet (Gist+Facts, n=2,236). Questionnaires were returned by 964/4,452 individuals (22%). 82% of respondents reported having read the information, but those with poor numeracy were less likely (74 vs. 88%, p<.001). The ‘Gist+Facts’ group were more likely to reach the criterion for adequate knowledge (95 vs. 91%; p<.01), but this was not moderated by numeracy. Most respondents (98%) intended to participate in screening, with no group differences and no interaction with numeracy. The improved levels of knowledge and self-reported reading suggest ‘The Gist’ leaflet may increase engagement with colorectal cancer screening, but ceiling effects reduced the likelihood that screening intentions would be affected.