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 (χ2 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.
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 (χ2 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.
Authors: David G Stewart; Claudine Moise-Campbell; Meredith K Chapman; Malini Varma; Elizabeth Lehinger Journal: J Racial Ethn Health Disparities Date: 2016-04-22
Authors: Randi Melissa Schuster; Ailish Hanly; Jodi Gilman; Alan Budney; Ryan Vandrey; A Eden Evins Journal: Drug Alcohol Depend Date: 2016-08-28 Impact factor: 4.492
Authors: Catherine Stanger; Emily A Scherer; Hoa T Vo; Steven F Babbin; Ashley A Knapp; James R McKay; Alan J Budney Journal: Psychol Addict Behav Date: 2019-06-27