a Moti-4 Research Project Coordinator, CAPHRI, School for Public Health and Primary Care , Maastricht University , Maastricht , the Netherlands.
b Manager, Addiction Prevention Department , Mondriaan , Heerlen , the Netherlands.
J Psychoactive Drugs. 2017 Nov-Dec;49(5):363-372. doi: 10.1080/02791072.2017.1325030. Epub 2017 May 26.
Previously, a Dutch randomized controlled trial evaluating an intervention aimed at changing adolescents' cannabis use, called Moti-4, has shown its efficacy. A secondary analysis of the Moti-4 data investigated the process of change specified by the Stage of Change (SOC) model in cannabis use during the trial. Seventy-one Moti-4 participants and 60 controls were recruited for the study with a pre-test, post-test (T1), and six-month follow-up (T2). All participants showed signs of problematic cannabis use. No contribution of the Moti-4 intervention to a change in SOC between T1 and T2 was found. Although motivation for treatment and motivation for change can be conceived as independent predictors of treatment outcome, the SOC a person is in does not mediate the effect of the intervention on change in cannabis use. However, a reduction in cannabis use was associated with a positive change in "action willingness," in line with the SOC model. In contrast to model expectations, a higher score on "contemplation" is associated with a higher cannabis consumption. Results highlight both the limitations and usefulness of the SOC model. Future interventions may focus more on the stage of "action willingness," as well as on perceived social norms.
先前，一项评估旨在改变青少年大麻使用的干预措施的荷兰随机对照试验（称为 Moti-4）已经显示出其效果。对 Moti-4 数据的二次分析调查了试验期间大麻使用中由阶段变化（SOC）模型指定的变化过程。Moti-4 计划的 71 名参与者和 60 名对照者被招募进行研究，采用预测试、后测试（T1）和六个月随访（T2）。所有参与者都表现出大麻使用问题的迹象。在 T1 和 T2 之间，Moti-4 干预措施对 SOC 变化没有贡献。尽管治疗动机和改变动机可以被视为治疗结果的独立预测因素，但一个人所处的 SOC 并不能调节干预对大麻使用变化的影响。然而，正如 SOC 模型所预期的那样，大麻使用量的减少与“行动意愿”的积极变化有关。与模型预期相反，“沉思”得分越高，与更高的大麻消费水平相关。结果既强调了 SOC 模型的局限性，也强调了它的有用性。未来的干预措施可能会更加关注“行动意愿”阶段，以及感知的社会规范。
