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大麻筛查量表(MSI-X):临床样本的信度、因子结构及评分标准

The Marijuana Screening Inventory (MSI-X): reliability, factor structure, and scoring criteria with a clinical sample.

作者信息

Alexander Dale E, Leung Patrick

机构信息

University of Houston, Graduate School of Social Work, Houston, TX 77204-4013, USA.

出版信息

Am J Drug Alcohol Abuse. 2004 May;30(2):321-51. doi: 10.1081/ada-120037381.

Abstract

OBJECTIVE

This study continues the psychometric evaluation of a 31-item Marijuana Screening Inventory (MSI-X) with adults referred to a substance abuse clinic, by determining MSI-X reliability, factor structure, scoring cutoff accuracy, sensitivity, and specificity with a DSM-IV-TR criterion measure.

METHOD

A "marijuana inventory" containing demographic, MSI-X, and DSM IV-TR diagnostic items was administered to 107 adults undergoing substance-use evaluation.

RESULTS

The MSI-X reliability was .90 with factor analysis deriving nine factors explaining 72.2% of the variance. Varimax rotation supports retention of all 31 items on nine factor-based scales. Receiver operating characteristic analysis determined MSI-X accuracy and cutoff points in relation to four DSM IV-TR diagnostic classifications. The MSI-X obtained the highest probability (.91) for accuracy in identifying both cannabis dependence and abuse, with six the optimal cutoff for maximum sensitivity (.83) and specificity (.89). Thus, MSI-X scores of > or = 6 are considered high risk. A cutoff score of 3 was associated with (probability, .90; sensitivity, .85; specificity, .81) identifying cannabis abuse only risk, providing a 3 to 5 score in the moderate risk range.

CONCLUSIONS

Clinical sample data supports the psychometric usefulness of the MSI-X as a screening tool. Marijuana lifetime use was 90% and past-year use 48%. The MSI-X identified 43% of lifetime users and 29% of past year users with moderate to high risk marijuana patterns deserving comprehensive evaluation. More males (15.9%) than females (7.5%) obtained MSI-X high-risk scores. The MSI-X empirically derived cutoff scores are within one point of the theoretical clinical cutoffs previously reported.

摘要

目的

本研究通过确定大麻筛查量表修订版(MSI-X)的信度、因子结构、评分临界值准确性、敏感性和特异性(采用《精神疾病诊断与统计手册》第四版修订版(DSM-IV-TR)标准测量),继续对转诊至药物滥用诊所的成年人进行31项大麻筛查量表修订版(MSI-X)的心理测量评估。

方法

对107名接受药物使用评估的成年人施测一份包含人口统计学、MSI-X和DSM-IV-TR诊断项目的“大麻量表”。

结果

MSI-X的信度为0.90,因子分析得出九个因子,解释了72.2%的方差。方差最大化旋转支持在基于九个因子的量表上保留所有31个项目。接受者操作特征分析确定了MSI-X与四种DSM-IV-TR诊断分类相关的准确性和临界值。MSI-X在识别大麻依赖和滥用方面的准确性概率最高(0.91),临界值为6时,敏感性(0.83)和特异性(0.89)最佳。因此,MSI-X得分≥6被视为高风险。临界值为3与识别仅大麻滥用风险相关(概率为0.90;敏感性为0.85;特异性为0.81),得分在3至5之间属于中度风险范围。

结论

临床样本数据支持MSI-X作为一种筛查工具的心理测量效用。终生使用大麻的比例为90%,过去一年使用大麻的比例为48%。MSI-X识别出43%的终生使用者和29%的过去一年使用者存在中度至高度风险的大麻使用模式,值得进行全面评估。获得MSI-X高风险评分的男性(15.9%)多于女性(7.5%)。MSI-X根据经验得出的临界值与先前报告的理论临床临界值相差不超过一分。

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