Steve Hicks School of Social Work, The University of Texas at Austin, Austin, Texas.
Center for Alcohol and Addiction Studies, Brown University School of Public Health, Providence, Rhode Island.
J Stud Alcohol Drugs. 2020 Mar;81(2):203-211. doi: 10.15288/jsad.2020.81.203.
Increasing numbers of substance users report simultaneous alcohol and marijuana (SAM) use such that their effects overlap. More research is needed to understand what motivates this behavior, especially to inform interventions that address SAM use. A 26-item measure of SAM motives was designed and tested in previous research. The purpose of the current study was to validate that measure and create a briefer version of it.
Using two waves of data from a multi-site sample of college students (n = 1,014), exploratory and confirmatory factor analyses were conducted to develop a brief 11-item SAM Motives Measure (B-SMM). Negative binomial regression analyses were conducted to assess the reliability and validity of both the original and brief measures.
The brief measure contains four subscales (conformity, positive effects, calm/coping, and social) that match the empirically supported motivational model of substance use. Internal consistency of the subscales ranged from .77 to .87. Most subscales significantly predicted frequency and consequences of SAM use both concurrently and prospectively.
The psychometrically sound measure developed in this study facilitates the examination of SAM motives in clinical settings with time-constrained patient contact and can be valuable for research involving frequent and repeated measures of substance use behaviors.
越来越多的物质使用者报告同时使用酒精和大麻（SAM），以至于它们的作用重叠。需要更多的研究来了解是什么促使这种行为发生，特别是为了解决 SAM 使用问题的干预措施提供信息。先前的研究设计并测试了一种 26 项 SAM 动机测量方法。本研究的目的是验证该测量方法并创建一个更简短的版本。
使用来自多地点大学生样本的两波数据（n = 1014），进行探索性和验证性因素分析，以开发一个简短的 11 项 SAM 动机测量（B-SMM）。使用负二项式回归分析评估原始和简短测量的可靠性和有效性。
简短的测量包含四个分量表（从众、积极影响、冷静/应对和社交），与物质使用的经验支持的动机模型相匹配。分量表的内部一致性范围从.77 到.87。大多数分量表在同时和前瞻性地显著预测了 SAM 使用的频率和后果。
本研究中开发的心理测量学可靠的测量方法促进了在临床环境中对 SAM 动机的检查，并且对于涉及频繁和重复测量物质使用行为的研究具有重要价值。
