Efficacy of an optimized mobile phone-based life skills training program for addiction prevention among adolescents: results of a cluster-randomized controlled trial

Two-arm, parallel-group, cluster-randomized controlled trial with assessments at baseline and follow-up after 6 months. School classes were randomized into two groups (1) an intervention group receiving the optimized program version or (2) a control group receiving the original version.

A total of 1,175 students from 67 Swiss secondary and upper secondary school classes, were invited to participate in the study between March 2023 and September 2024. Of these, 890 (75.7%) students (mean age 14.9 years, 57.4% female) participated in the study. Six-month follow-up assessments were completed by 552 (62.0%) out of the 890 study participants.

-