Trial Outcomes & Findings for Network Intervention to Prevent Vaping (NCT NCT04678245)

Nineteen schools in 14 school districts recruited students across three cohorts. A total of 2,967 students completed the baseline assessment. Additional eligible students entered the study at subsequent assessment waves, resulting in a cumulative enrollment of 3,950 participants. The final analysis sample included 3,515 participants.

The first two cohorts had 4 schools, so two each were assigned to waitlist and intervention. To balance school size, in the third cohort one large district (3 middle schools) was randomized with 3 smaller schools.

Unit of analysis: School

Network Intervention to Prevent Vaping

Self reported use of any electronic vaping product during the past 30 days, assessed using participant questionnaire. The outcome is reported as the number of participants reporting any vaping within the previous 30 days.

Self reported nicotine containing electronic vaping product use during the previous 30 days, assessed by participant questionnaire. The outcome is reported as the number of participants reporting nicotine vaping.

Perceived harm of electronic vaping products was assessed using a single questionnaire item scored from 0 (No risk) to 3 (Great risk). Higher scores indicate greater perceived harm.

Attitudes toward electronic vaping products were assessed using participant responses to 7 items evaluating whether vaping is good, fun, interesting, or exciting. Responses were averaged to produce a mean score ranging from 1 (Strongly disagree) to 5 (Strongly agree). Higher scores indicate more favorable attitudes toward vaping.

Participants identified trusted adults at school with whom they could discuss personal concerns. The outcome is reported as the total number of trusted adults identified (range 0 to 7).