Exploring the Validity of the Short Version of the Problem Behaviours Assessment (PBA-s) for Huntington's disease: A Rasch Analysis
Exploring the Validity of the Short Version of the Problem Behaviours Assessment (PBA-s) for Huntington's disease: A Rasch Analysis
复制标题
DOI：
10.3233/jhd-150164
复制
发表时间：
2015-01-01
影响因子：
3.1
通讯作者：
Craufurd, David
中科院分区：
文献类型：
--
作者：
McNally, George;Rickards, Hugh;Craufurd, David
背景资料：问题行为评估（PBA-s）的简短版本是亨廷顿病行为症状的推荐结果测量。Rasch分析被用来进一步调查的测量局限性的PBA-s.Objectives：1）评估的心理测量特性的11个严重程度和频率项目内的PBA-s和2），以确定结构效度使用总PBA-s得分作为一个临床outcome measure.Methods：PBA-s数据的517名参与者从登记-HD被列入Rasch分析。使用RUMM 2030软件对PBA的严重程度和频率项进行单独分析。实现模型的拟合提供了支持证据，证明所有项目都有助于一个潜在的潜在特质。这个属性被定义为内部结构validity.Results：总PBA-S严重程度评分表现出几个重要的局限性，包括所有11个严重程度项目，当地的依赖性和针对性差的无序响应类别。然而，修改原来的五点评分系统，以四点系统导致有序的反应类别的严重性项目的七个，并取得了良好的整体适合Rasch模型。对于总PBA-S的频率得分，适合的模型是没有实现的，即使修正后的评分system.Conclusions：这项研究表明，减少到四点评分系统，总PBA-S的严重程度评分可能被认为是一个有效的临床结果的措施。这项研究还表明使用总PBA-s频率评分的局限性。
Background: The short version of the Problem Behaviours Assessment (PBA-s) is the recommended outcome measure for behavioural symptoms in Huntington's disease. Rasch analysis was used to further investigate the measurement limitations of the PBA-s.Objectives: 1) To assess the psychometric properties of the 11 severity and frequency items within the PBA-s and 2) to determine the construct validity of using a total PBA-s score as a clinical outcome measure.Methods: PBA-s data for 517 participants from Enroll-HD were included in the Rasch analysis. Separate analyses were conducted for the severity and frequency items of the PBA-s, using RUMM2030 software. Achieving fit to the model provides supporting evidence that all items contribute to a single underlying latent trait. This property is defined as internal construct validity.Results: The total PBA-s severity score demonstrated several important limitations, including disordered response categories for all 11 severity items, local dependency and poor targeting. However, modifying the original five-point scoring system to a four-point system resulted in ordered response categories for seven of the severity items and achieved a good overall fit to the Rasch model. For the total PBA-s frequency score, fit to the model was not achieved even after amendments to the scoring system.Conclusions: This study suggests that with reduction to a four-point scoring system, the total PBA-s severity score may be considered a valid clinical outcome measure. This study also suggests limitations in the use of a total PBA-s frequency score.