Risk communication in tables vs. text: a Registered Report randomised trial on 'fact boxes'
ObjectivesAbstractIdentifying effective summary formats is fundamental to multiple fields including science communication, systematic reviews, evidence-based policy, and medical decision making. This study will test whether table or text-only formats lead to better comprehension of the potential harms and benefits of different options, here in a medical context.DesignPre-registered, longitudinal experiment: between-subjects factorial 2 (message format) x 2 topic (topic: therapeutic or preventative intervention) on comprehension and later recall (CONSORT- SPI 2018).SettingLongitudinal online survey experiment.Participants[[ N ]] census-matched UK residents recruited through the survey panel firm YouGov. Primary outcome measureComprehension of harms and benefits and knowledge recall after one month.ResultsFact boxes—simple tabular messages—led to [[ less, equal, more ]] comprehension than text- only formats and [[ greater, equal, lower ]] knowledge recall after one month. Fact boxes led to [[more, equivalent, fewer]] treatment decisions compared to the text-only control. These patterns of results were [[ the same, different ]] between the two topics [[ explain any differences ]].ConclusionsThe brief table format of the fact box [[ improved, did not improve ]] comprehension of harms and benefits relative to the text-only control. Effective communication supports informed consent and decision making and brings ethical and practical advantages. Fact boxes and other summary formats may be effective in a wide range of communication contexts.