Evidence Based Treatment Centers of Seattle (EBTCS), USA; University of Washington, Department of Psychiatry and Behavioral Sciences, USA.
Evidence Based Treatment Centers of Seattle (EBTCS), USA; University of Washington, Department of Psychiatry and Behavioral Sciences, USA; University of Washington, Department of Psychology, USA.
J Affect Disord. 2015 Apr 1;175:463-70. doi: 10.1016/j.jad.2015.01.041. Epub 2015 Jan 22.
Comorbidity among anxiety-related diagnoses is common, highlighting the need for brief, meaningful measures of anxiety that cut across diagnoses.
The current study examined the psychometric properties of one such measure, the Overall Anxiety Severity and Impairment Scale (OASIS) (Norman et al., 2006), in a naturalistic sample of individuals seeking treatment at an outpatient anxiety treatment center. We examined the measure׳s structure, convergent validity, and potential effects of respondent gender. Using ROC analysis, we estimated an optimal cut-score for determining presence of an anxiety disorder in this sample. Finally, we examined the responsiveness of the OASIS to clinical change and calculated a reliable change index.
We found strong psychometric properties of the OASIS. A unitary factor structure with correlated residuals on the first two items provided the best fit to the data. A cut-score of eight best distinguished the presence of an anxiety-related diagnosis. In measurement invariance analyses, we found evidence that men and women respond similarly to the measure. In addition, we found that change in the OASIS was correlated with change in other measures, and we estimated that a four-point change in the OASIS can be considered clinically reliable.
Sample characteristics may limit generalizability. Diagnoses were established by clinicians using a semi-structured interview that, while based upon DSM-IV diagnostic criteria, has not been psychometrically evaluated.
The results provide support for the use of the OASIS in specialty treatment for anxiety-related diagnoses and further highlight the strengths of this measure in clinical practice and research settings.
焦虑相关诊断的共病很常见，这突出表明需要一种简短而有意义的焦虑测量方法，该方法可以跨越不同的诊断。
本研究在寻求门诊焦虑治疗中心治疗的自然人群中，检查了一种这样的测量方法，即总体焦虑严重程度和障碍量表（OASIS）（Norman 等人，2006 年）的心理测量特性。我们检查了该测量的结构、收敛效度以及受访者性别可能产生的影响。我们使用 ROC 分析，估计了在该样本中确定是否存在焦虑障碍的最佳切点。最后，我们检查了 OASIS 对临床变化的反应能力，并计算了可靠的变化指数。
我们发现 OASIS 具有很强的心理测量特性。第一项和第二项具有相关残差的单一因素结构为数据提供了最佳拟合。八分为最佳切点，可以区分是否存在与焦虑相关的诊断。在测量不变性分析中，我们发现男性和女性对该测量的反应相似的证据。此外，我们发现 OASIS 的变化与其他测量的变化相关，我们估计 OASIS 的四点变化可以被认为是临床可靠的。
样本特征可能会限制其普遍性。诊断是由临床医生使用半结构化访谈确定的，尽管该访谈基于 DSM-IV 诊断标准，但尚未进行心理测量评估。
这些结果为在焦虑相关诊断的专业治疗中使用 OASIS 提供了支持，并进一步强调了该测量在临床实践和研究环境中的优势。
