Statistical Analyses
ADVERSE EFFECTS
The online questionnaire did not allow for item nonresponse; thus, all questionnaires were fully complete. Mann-Whitney–Wilcoxon rank testing was used to test whether the 2 information formats were associated with different likelihoods of positive (and negative) change in categories of vaccination intention and benefit-to-harm assessment (absolute percentages of respondents) from baseline to postintervention. Log-linear analyses were performed to investigate associations of likelihood of positive (and negative) change with assessment of the government’s COVID-19 containment strategies, attitudes to COVID-19 vaccination, and demographic characteristics. Log-linear analyses were adjusted for nonbalanced variables between groups at baseline (education, benefit-to-harm assessment, assessment of governmental containment strategies, and vaccine-related concern about long-term adverse effects due to novelty). Reported adjusted odds ratios (aOR) reflect the likelihood of positive or negative change (across 1 or more) categories from baseline to postintervention. Percentage values are absolute percentage points. 