Data Analysis Plan
The data was analysed using IBM SPSS software (version 27). To test that randomisation was successful, two-way analyses of variances (ANOVAs) and chi-square tests were conducted on baseline, demographic and medical variables. Any significant differences on these variables resulted in them being entered as covariates in subsequent analyses. To test whether the manipulation was successful, two-way ANOVAs were conducted on the threat and efficacy measures. Two-way ANOVAs were also conducted on the number of health-threat responses made in the ambiguous word task and on behavioural intentions. Lastly, Pearson correlations were calculated between the baseline and dependent variables.