Refining the Marijuana Purchase Task: Using Qualitative Methods to Inform Measure Development
Refining the Marijuana Purchase Task: Using Qualitative Methods to Inform Measure Development
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DOI：
10.1037/pha0000355
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发表时间：
2021-02-01
影响因子：
2.3
通讯作者：
MacKillop, James
中科院分区：
文献类型：
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作者：
Aston, Elizabeth R.;Metrik, Jane;MacKillop, James
对大麻的行为经济需求（即，相对强化值）可以通过大麻购买任务（MPT）来测量。然而，商品的模糊性带来了挑战，目前的MPT在设计上存在着问题。本2阶段研究的目的是使用定性方法修改和改进MPT。第一阶段：定期（即，平均使用>=一次/周）大麻使用者（n = 31;每组6-7人，M[SD]年龄= 26 [7]; 28%为女性）。焦点小组遵循半结构化的议程，并就MPT的关键主题进行了执行摘要。反馈被用来完善MPT。第二阶段：使用改进的MPT对常规大麻使用者进行认知访谈（n = 20; M[SD]年龄= 28 [8]; 50%女性）。第一阶段：焦点小组分析强调了MPT改进的4个关键领域：（a）购买单位，（B）大麻质量，（c）使用事件指定的持续时间，（d）价格。与会者建议使用克作为购买单位，为个人量身定制大麻质量，并澄清预期的发作长度。第二阶段：认知访谈指出了任务细化的其他领域，导致基于2个阶段的MPT的第二次迭代。在这两个阶段的定性研究提出了一些实质性的修改MPT格式。MPT的修改，预计将提高理解，生态效度，和一般结构效度。研究结果强调了仔细的指导设置开发药物购买任务的异质产品，没有标准的消费单位的重要性。
Behavioral economic demand for cannabis (i.e., relative reinforcing value) can be measured via marijuana purchase tasks (MPTs). However, commodity ambiguities pose challenges and design concerns exist regarding current MPTs. The aim of this 2-phase study was to modify and improve a MPT using qualitative methods. Phase I: Focus groups were conducted with regular (i.e., average use >= once/week) cannabis users (n = 31; 6-7 per group M[SD] age = 26 [7]; 28% female). Focus groups followed a semistructured agenda, and executive summaries were made concerning key MPT themes. Feedback was used to refine the MPT. Phase II: Cognitive interviews using the refined MPT were conducted with regular cannabis users (n = 20; M[SD] age = 28 [8]; 50% female). Phase I: Focus group analyses highlighted 4 critical areas for MPT improvement: (a) unit of purchase, (b) cannabis quality, (c) time duration specified for use episode, and (d) price. Participants suggested using grams as the unit of purchase, tailoring cannabis quality to the individual, and clarifying intended episode length. Phase II: Cognitive interviewing indicated additional areas for task refinement, resulting in a second iteration of the MPT based on the 2 phases. Qualitative research in both phases suggested a number of substantive modifications to the MPT format. MPT modifications are expected to improve comprehension, ecological validity, and general construct validity. Findings highlight the importance of careful instructional set development for drug purchase tasks for heterogeneous products that do not have standard units of consumption.