Department of Medicine and Health Science "Vincenzo Tiberio", University of Molise, Campobasso, Italy.
IRCCS Istituto delle Scienze Neurologiche di Bologna, Bologna, Italy.
J Rehabil Med. 2024 Jan 10;56:jrm15774. doi: 10.2340/jrm.v56.15774.
To assess the internal construct validity, including local independence, unidimensionality, monotonicity, and invariance, reliability, and targeting of the Forgotten Joint Score within the Rasch Measurement Theory framework.
Cross-sectional study.
A total of 111 patients with total hip arthroplasty at least 3 months after surgery.
The Forgotten Joint Score was submitted to each subject during their rehabilitative treatment in an Italian centre and then to Rasch analysis.
The base Rasch analysis showed a satisfactory fit to the model with strict unidimensionality and no differential item functioning. However, monotonicity (11 out of 12 items showed disordered thresholds) and local independence were violated. After rescoring 10 items and creating 5 subtests to account for local dependence, the scale satisfied all the other Rasch model requirements (i.e. invariance, local independence, monotonicity, unidimensionality, and multi-group invariance), with reliability indexes (> 0.850) for measurement at the individual level and proper targeting. A raw-score-to-measure conversion table was provided.
After structural (i.e. collapsing items categories) and non-structural (i.e. creating subtests) strategies, the Forgotten Joint Score satisfied the measurement requirements of the Rasch model, and it can be used in patients with total hip arthroplasty in clinical and research settings.
在 Rasch 测量理论框架内评估遗忘关节评分的内部结构效度，包括局部独立性、单维性、单调性和不变性、可靠性和针对性。
横断面研究。
共 111 例全髋关节置换术后至少 3 个月的患者。
在意大利中心接受康复治疗期间，每位患者均提交遗忘关节评分，然后进行 Rasch 分析。
基础 Rasch 分析显示，模型拟合度良好，具有严格的单维性和无差异项目功能。然而，单调性（12 个项目中的 11 个显示出无序阈值）和局部独立性受到违反。经过重新评分 10 个项目并创建 5 个子测试来解释局部依赖性后，该量表满足了 Rasch 模型的所有其他要求（即不变性、局部独立性、单调性、单维性和多组不变性），测量个体水平的可靠性指标（>0.850）和适当的针对性。提供了原始分数到测量的转换表。
经过结构（即折叠项目类别）和非结构（即创建子测试）策略后，遗忘关节评分满足 Rasch 模型的测量要求，可用于全髋关节置换术后患者的临床和研究环境。
