Group differences
PMT
Separate one-way factorial repeated measure ANOVAs showed that the two treatment groups differed significantly across time on PS and PV. Specifically, the PMT intervention group scored higher on both threat components than their attention control counterparts. Non-significant treatment by time group differences for intention to reduce vaping behaviour were found. The effect size for this interaction was moderate in size and favoured the PMT intervention group. Non-significant effects were revealed between treatment groups for vaping behaviour for the follow-up assessments. The effect size for this interaction was large, and favoured the PMT intervention group, particularly towards the end of treatment (