Campbell-Sills Laura, Norman Sonya B, Craske Michelle G, Sullivan Greer, Lang Ariel J, Chavira Denise A, Bystritsky Alexander, Sherbourne Cathy, Roy-Byrne Peter, Stein Murray B
Department of Psychiatry, University of California, San Diego, La Jolla, CA 92093-0603, USA.
J Affect Disord. 2009 Jan;112(1-3):92-101. doi: 10.1016/j.jad.2008.03.014. Epub 2008 May 16.
The Overall Anxiety Severity and Impairment Scale (OASIS) is a 5-item self-report measure that can be used to assess severity and impairment associated with any anxiety disorder or multiple anxiety disorders. A prior investigation with a nonclinical sample supported the reliability and validity of the OASIS; however, to date it has not been validated for use in clinical samples.
The present study assessed the psychometric properties of the OASIS in a large sample (N=1036) of primary care patients whose physicians referred them to an anxiety disorders treatment study. Latent structure, internal consistency, convergent/discriminant validity, and cut-score analyses were conducted.
Exploratory and confirmatory factor analyses supported a unidimensional structure. The five OASIS items displayed strong loadings on the single factor and had a high degree of internal consistency. OASIS scores demonstrated robust correlations with global and disorder-specific measures of anxiety, and weak correlations with measures of unrelated constructs. A cut-score of 8 correctly classified 87% of this sample as having an anxiety diagnosis or not.
Convergent validity measures consisted solely of other self-report measures of anxiety. Future studies should evaluate the convergence of OASIS scores with clinician-rated and behavioral measures of anxiety severity.
Overall, this investigation suggests that the OASIS is a valid instrument for measurement of anxiety severity and impairment in clinical samples. Its brevity and applicability to a wide range of anxiety disorders enhance its utility as a screening and assessment tool.
总体焦虑严重程度与功能损害量表（OASIS）是一种包含5个条目的自我报告量表，可用于评估与任何一种焦虑症或多种焦虑症相关的严重程度和功能损害。先前对非临床样本的一项调查支持了OASIS的信效度；然而，迄今为止，它尚未在临床样本中得到验证。
本研究在一个由医生转介至焦虑症治疗研究的初级保健患者大样本（N = 1036）中评估了OASIS的心理测量特性。进行了潜在结构、内部一致性、聚合/区分效度和划界分数分析。
探索性和验证性因素分析支持单维结构。OASIS的5个条目在单一因素上显示出很强的负荷，并且具有高度的内部一致性。OASIS得分与焦虑的总体和特定障碍测量指标显示出很强的相关性，与无关构念的测量指标相关性较弱。划界分数为8时，能正确地将该样本中87%的患者分类为患有或未患有焦虑症。
聚合效度测量仅由其他焦虑的自我报告量表组成。未来的研究应评估OASIS得分与临床医生评定的焦虑严重程度和行为测量指标的一致性。
总体而言，本研究表明OASIS是一种用于测量临床样本中焦虑严重程度和功能损害的有效工具。其简短性以及对广泛焦虑症的适用性增强了其作为筛查和评估工具的效用。
