As research and clinical settings increasingly emphasize questions of change, it is crucial that our mechanistic and outcome variables are established as reliable and valid measures of such change. However, there is often a mismatch between the purposes for which symptom measures were developed and validated versus their application. Traditional psychometric theory has focused largely on between-person change, whereas increasingly research and clinical questions concern within-person change. We examined the psychometric properties of two commonly used measures of obsessive-compulsive symptoms (Yale-Brown Obsessive Compulsive Scale, YBOCS; Dimensional Obsessive-Compulsive Scale, DOCS) within a longitudinal treatment context (N = 570). Regarding reliability, we applied traditional (i.e., internal consistency at each week) and novel methods that allow for examination of the reliability of both within- and between-person change (i.e., variance partitioning based on generalizability theory). We examined longitudinal concurrent validity by correlating per-person slopes of obsessive-compulsive and depression symptom measures obtained via mixed-effects models. Within-person change reliability was acceptable or good for the YBOCS and DOCS total scores (.77, .83), suggesting that these measures are capable of capturing meaningful changes that exist within persons over time, and between-person change reliability was excellent (.99-1.0). Per-person slopes analyses supported the longitudinal concurrent validity of both measures. Our data support the continued use of the YBOCS and DOCS as measures of obsessive-compulsive symptoms for the purpose of many longitudinal research questions. The current study provides a template for reestablishing the psychometric properties of other commonly used measures in the context of longitudinal investigations. (PsycInfo Database Record (c) 2021 APA, all rights reserved).

中文翻译：

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在纵向背景下重新评估症状测量的心理测量特性：耶鲁布朗强迫量表和维度强迫量表。

随着研究和临床环境越来越强调变化的问题，我们的机制和结果变量被建立为这种变化的可靠和有效的衡量标准是至关重要的。但是，开发和验证症状测量的目的与其应用之间通常存在不匹配。传统的心理测量理论主要关注人与人之间的变化，而越来越多的研究和临床问题关注人内的变化。我们在纵向治疗背景下（N = 570）检查了两种常用的强迫症状测量（耶鲁-布朗强迫量表，YBOCS；维度强迫量表，DOCS）的心理测量特性。关于可靠性，我们应用了传统的（即，每周的内部一致性）和允许检查人内和人之间变化的可靠性的新方法（即，基于泛化理论的方差划分）。我们通过将通过混合效应模型获得的强迫症和抑郁症状测量的人均斜率相关联来检查纵向并发有效性。YBOCS 和 DOCS 总分 (.77, .83) 的人内变化可靠性是可以接受或良好的，这表明这些措施能够捕捉随着时间的推移存在于人体内的有意义的变化，人与人之间的变化可靠性非常好（ .99-1.0）。每个人的斜率分析支持这两种措施的纵向并发有效性。我们的数据支持继续使用 YBOCS 和 DOCS 作为许多纵向研究问题的强迫症状测量。当前的研究为在纵向调查的背景下重建其他常用措施的心理测量特性提供了一个模板。（PsycInfo 数据库记录 (c) 2021 APA，保留所有权利）。