Statistical analyses
REGRESSION
All analyses were conducted using IBM SPSS Statistics 25 for MacOS. Presentation of statistical results and analyses methods for both completed data and imputed data (sensitivity) are illustrated separately below. Both data sets used one-way ANOVAs and chi-square procedures to ensure that there were no systematic differences between groups on demographic characteristics. Separate 2 (group) by 4 (time) repeated measures ANOVAs were conducted for each of the variable measures: PV, PS, intention, and behaviour. Pearson correlation analyses were used to measure the statistical strength and direction of relationship between threat appraisal variables, vaping intention, and behaviour. Finally, a linear regression model was conducted to predict the parameters of threat appraisal on intention and intention on behaviour.