Psychometric Evaluation of the Insomnia Severity Index in U.S. College Students

IF 3.4 2区心理学 Q2 PSYCHIATRY

Behavior Therapy Pub Date : 2024-02-29 DOI:10.1016/j.beth.2024.02.003

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Abstract

Psychometric properties of the Insomnia Severity Index (ISI) were analyzed in U.S. college samples. ISI items and total score with sleep and psychosocial questionnaires were examined in Experiment I. ISI diagnostic accuracy in a clinical sample with and without insomnia was assessed in Experiment II. ISI test–retest validity, confirmatory factor analysis (CFA), and item response theory via graded response model (GRM) were assessed in Experiment III. Results indicated analogous ISI and sleep diary items showed moderate correlations (r₁ = .40; r₂ = .45). The ISI total had weak to strong correlations with other indicators of sleep-related disturbance (rs = .25–.62). The ISI had weak to moderate correlations with psychosocial measures commonly associated with insomnia (rs = .10–.57). The diagnostic accuracy of the ISI was very high (area under the curve [AUC] = .999). Sensitivity and specificity were maximized at a cutoff score ≥ 8. The ISI demonstrated good test–retest reliability (ICC = .87). CFA revealed a three-factor model for two study samples and GRM indicated better ability of the ISI to assess moderate (Sample III) and moderate to high (Sample I) levels of insomnia severity. The ISI demonstrated good psychometric properties and appears generally valid for screening insomnia disorder and assessing insomnia severity in college students. Overlap with psychological symptoms suggests caution while interpreting these constructs independently.

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美国大学生失眠严重程度指数的心理计量学评估

在美国大学样本中分析了失眠严重程度指数（ISI）的心理计量特性。实验 I 对 ISI 项目和总分以及睡眠和社会心理调查问卷进行了检验；实验 II 评估了 ISI 在患有和未患有失眠症的临床样本中的诊断准确性。实验三评估了 ISI 测试-重测有效性、确证因子分析（CFA）以及通过分级反应模型（GRM）进行的项目反应理论。结果表明，类似的 ISI 和睡眠日记项目显示出中等程度的相关性（r1 = .40；r2 = .45）。ISI 总分与其他睡眠相关干扰指标的相关性由弱到强（rs = .25-.62）。ISI 与通常与失眠相关的社会心理测量指标（rs = .10-.57）存在弱到中等程度的相关性。ISI 的诊断准确性非常高（曲线下面积 [AUC] = 0.999）。灵敏度和特异性在分界点分数≥ 8 时达到最高。ISI 的测试-再测可靠性良好（ICC = .87）。CFA显示了两个研究样本的三因素模型，GRM显示ISI在评估中度（样本III）和中度至高度（样本I）失眠严重程度方面有更好的能力。ISI 具有良好的心理测量特性，在筛查失眠症和评估大学生失眠严重程度方面基本有效。与心理症状的重叠表明，在独立解释这些结构时需要谨慎。

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来源期刊

Behavior Therapy Multiple-

CiteScore

7.40

自引率

2.70%

发文量

113

审稿时长

121 days

期刊介绍： Behavior Therapy is a quarterly international journal devoted to the application of the behavioral and cognitive sciences to the conceptualization, assessment, and treatment of psychopathology and related clinical problems. It is intended for mental health professionals and students from all related disciplines who wish to remain current in these areas and provides a vehicle for scientist-practitioners and clinical scientists to report the results of their original empirical research. Although the major emphasis is placed upon empirical research, methodological and theoretical papers as well as evaluative reviews of the literature will also be published. Controlled single-case designs and clinical replication series are welcome.