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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在纵向情境中重新评估症状量度的心理计量学性质：耶鲁-布朗强迫症量表和维度强迫症量表。

随着研究和临床环境越来越强调变化的问题，至关重要的是，将我们的机制和结果变量确定为这种变化的可靠且有效的度量。但是，在开发和验证症状措施的目的与应用目的之间常常会出现不匹配的情况。传统的心理计量学理论主要集中在人与人之间的变化上，而越来越多的研究和临床问题涉及人与人之间的变化。我们研究了在纵向治疗范围内（N = 570）的两种强迫症症状的常用量度（耶鲁-布朗强迫症量表，YBOCS；维度强迫症量表，DOCS）。关于可靠性，我们采用了传统的（即 内部一致性）和新颖的方法，可以检查人与人之间和人与人之间变化的可靠性（即，基于概化理论的方差划分）。我们通过关联通过混合效应模型获得的强迫症和抑郁症症状度量的人均斜率来检验纵向并发有效性。人际变化的可靠性对于YBOCS和DOCS总分来说是可以接受的或良好的（.77，.83），表明这些措施能够捕捉随着时间变化而存在于人体内的有意义的变化，并且人际变化的可靠性非常好（ .99-1.0）。人均斜率分析支持两种方法的纵向并发有效性。我们的数据支持继续使用YBOCS和DOCS作为强迫症症状的量度，以用于许多纵向研究问题。当前的研究提供了一个模板，用于在纵向调查的背景下重建其他常用度量的心理计量特性。（PsycInfo数据库记录（c）2021 APA，保留所有权利）。