Psychometric Properties of the General Anxiety Disorder 7-Item (GAD-7) Scale in a Heterogeneous Psychiatric Sample
Psychometric Properties of the General Anxiety Disorder 7-Item (GAD-7) Scale in a Heterogeneous Psychiatric Sample
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DOI：
10.3389/fpsyg.2019.01713
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发表时间：
2019-08-06
影响因子：
3.8
通讯作者：
Hoffart, Asle
中科院分区：
文献类型：
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作者：
Johnson, Sverre Urnes;Ulvenes, Pal Gunnar;Hoffart, Asle
GAD-7通常被用作各种环境和人群中广泛焦虑症状的衡量标准。然而，一直存在分歧的因素结构的GAD-7，有必要进行更大的研究调查的心理测量特性的措施。接受治疗的患者（N = 1201），包括住院和门诊患者，在治疗前和治疗后完成了GAD-7。抑郁，幸福和其他焦虑措施的措施也完成了，使人们有可能调查收敛和发散的有效性。总样本的内部一致性和收敛效度非常好，并且与治疗组相关的变异可以接受。我们进行了探索性因素分析（EFA）的随机样本（50%）的患者在摄入量，然后进行了验证性因素分析（CFA），以确认在其他部分的样本在摄入量的因素结构。EFA表明一个明确的单因素解决方案，但单因素解决方案与CFA提供了一个穷人的数据拟合。将评估躯体症状的项目之间的残差关联起来，可以很好地拟合重新指定的CFA解决方案。GAD-7具有良好的内部一致性，支持异质性临床人群的单因素结构。
The GAD-7 is commonly used as a measure of general anxiety symptoms across various settings and populations. However, there has been disagreement regarding the factor structure of the GAD-7, and there is a need for larger studies investigating the psychometric properties of the measure. Patients undergoing treatment (N = 1201), both inpatient and outpatient patients, completed the GAD-7 at pre- and post-treatment. Measures of depression, well-being, and other anxiety measures were also completed, making it possible to investigate convergent and divergent validity. Internal consistency and convergent validity were excellent for the total sample, and there was acceptable variation related to treatment groups. We conducted an exploratory factor analysis (EFA) on a random sample (50%) of the patients at intake and then conducted a confirmatory factor analysis (CFA) to confirm the factor structure in the other part of the sample at intake. The EFA indicated a clear one-factor solution, but the one-factor solution with CFA provided a poor fit to the data. Correlating the residuals among items assessing somatic symptoms led to a good fit in a respecified CFA solution. The GAD-7 has excellent internal consistency, and the one-factor structure in a heterogeneous clinical population was supported.