title: The effect of a supplementary ('Gist-based') information leaflet on colorectal cancer knowledge and screening intention: a randomized controlled trial.
abstract: 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 45-59 years 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.
authors.affiliation: Department of Epidemiology and Public Health, University College London, 1-19 Torrington Place, London, WC1E 6BT, UK, samuel.smith@ucl.ac.uk.
authors.forename: Samuel G
authors.initials: SG
authors.lastname: Smith
authors.forename: Rosalind
authors.initials: R
authors.lastname: Raine
authors.forename: Austin
authors.initials: A
authors.lastname: Obichere
authors.forename: Michael S
authors.initials: MS
authors.lastname: Wolf
authors.forename: Jane
authors.initials: J
authors.lastname: Wardle
authors.forename: Christian
authors.initials: C
authors.lastname: von Wagner
mesh_terms: D003071:Cognition; D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000523:psychology*; D005260:Female; D017143:Fuzzy Logic; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D033182:Intention; D008297:Male; D008875:Middle Aged; D010353:Patient Education as Topic / Q000379:methods*