Historique
Article de Périodique
Effectiveness of motivational incentives for adolescent marijuana users in a school-based intervention (2015)
Auteur(s) :
STEWART, D. G. ;
FELLEMAN, B. I. ;
ARGER, C. A.
Année
2015
Page(s) :
43-50
Langue(s) :
Anglais
Domaine :
Drogues illicites / Illicit drugs
Thésaurus géographique
ETATS-UNIS
Thésaurus mots-clés
MILIEU SCOLAIRE
;
MOTIVATION
;
INTERVENTION
;
ADOLESCENT
;
CANNABIS
;
EFFICACITE
;
USAGE PROBLEMATIQUE
Résumé :
Purpose: This study examined whether adolescents receiving Motivational Interviewing (MI) intervention have different outcomes compared to those receiving Motivational Incentives (Motivational Interviewing combined with Contingency Management; MI + CM).
Method: A total of 136 adolescents (from a parent study of 220 adolescents) with problematic substance use were recruited from 8 high schools in Washington State, where they completed either 8-weeks of MI or MI + CM. Frequency of marijuana use was assessed at baseline, at the end-of-treatment, and at 16-week follow-up.
Results: A balanced and matched sample was created using propensity scores, then analyzed using Hierarchical Linear Modeling (HLM). Multilevel regression analyses revealed that adolescents who received MI + CM exhibited a greater reduction in use across time (p < .05). Reductions at the end-of-treatment were greater for the MI + CM condition (Cohen's d = -.82) compared to MI alone (Cohen's d = - .33), but did not differ at 16-week follow-up. Adolescents receiving MI + CM showed significantly fewer negative consequences of marijuana use at the end-of-treatment (t1, 124 = 2.26, p < .05), higher use of coping strategies (t1, 124 = 3.01, p < .01), and increased likelihood to attend additional treatment for substance use (Chi² 1, 124 = 4.12 p < .05), though hypothesized improvements in motivation and school attendance were not found. Use of coping strategies at the end-of-treatment had a significant indirect effect on the relationship between the intervention condition and marijuana use at the end-of-treatment (F3, 121 = 10.20, R2 = .20, p < .01).
Conclusion: These results suggest that the inclusion of contingencies into adolescent marijuana treatment decreases the end-of-treatment frequency of marijuana use and related consequences while increasing the use of coping strategies and the pursuit of additional treatment.
Highlights:
We examined the effectiveness of a school-based Motivational Incentives intervention.
Contingencies condition decreased marijuana use in adolescents at 8 week follow up.
Coping skills and treatment utilization increased in the contingency condition.
Use of coping skills mediated the treatment effect and may be a mechanism of change.
Method: A total of 136 adolescents (from a parent study of 220 adolescents) with problematic substance use were recruited from 8 high schools in Washington State, where they completed either 8-weeks of MI or MI + CM. Frequency of marijuana use was assessed at baseline, at the end-of-treatment, and at 16-week follow-up.
Results: A balanced and matched sample was created using propensity scores, then analyzed using Hierarchical Linear Modeling (HLM). Multilevel regression analyses revealed that adolescents who received MI + CM exhibited a greater reduction in use across time (p < .05). Reductions at the end-of-treatment were greater for the MI + CM condition (Cohen's d = -.82) compared to MI alone (Cohen's d = - .33), but did not differ at 16-week follow-up. Adolescents receiving MI + CM showed significantly fewer negative consequences of marijuana use at the end-of-treatment (t1, 124 = 2.26, p < .05), higher use of coping strategies (t1, 124 = 3.01, p < .01), and increased likelihood to attend additional treatment for substance use (Chi² 1, 124 = 4.12 p < .05), though hypothesized improvements in motivation and school attendance were not found. Use of coping strategies at the end-of-treatment had a significant indirect effect on the relationship between the intervention condition and marijuana use at the end-of-treatment (F3, 121 = 10.20, R2 = .20, p < .01).
Conclusion: These results suggest that the inclusion of contingencies into adolescent marijuana treatment decreases the end-of-treatment frequency of marijuana use and related consequences while increasing the use of coping strategies and the pursuit of additional treatment.
Highlights:
We examined the effectiveness of a school-based Motivational Incentives intervention.
Contingencies condition decreased marijuana use in adolescents at 8 week follow up.
Coping skills and treatment utilization increased in the contingency condition.
Use of coping skills mediated the treatment effect and may be a mechanism of change.
Affiliation :
Seattle Pacific University, Seattle, WA, USA