Feng Sarah, McDaniel Sydney, Van de Winckel Ann
Breck School, Golden Valley, MN, United States.
Division of Physical Therapy, Division of Rehabilitation Science, Department of Rehabilitation Medicine, Medical School, University of Minnesota, Minneapolis, MN, United States.
Front Rehabil Sci. 2023 Oct 2;4:1222892. doi: 10.3389/fresc.2023.1222892. eCollection 2023.
The Functionality Appreciation Scale (FAS) measures an individual's appreciation for the functions their body can perform, regardless of the individual's physical limitations. Prior studies reported on internal consistency, test-retest reliability, convergent validity, and exploratory or confirmatory factor analyses, but Rasch analysis has not yet been performed to evaluate the structural validity of the FAS.
We recruited community-dwelling adults at the Minnesota State Fair and through contact lists of participants identifying interest in research done in the Brain Body Mind Lab (University of Minnesota). Community-dwelling adults with spinal cord injury (SCI) completed the FAS over Zoom. We analyzed the FAS using Rasch Measurement Theory, which produced the following outputs: item, and person fit, targeting, unidimensionality, person separation reliability (PSR), local item dependence (LID), principal component analysis of residuals (PCAR), and differential item functioning (DIF).
We recruited 567 participants (average age 52.15 ± 17.5 years, 63.84% women), among which 14 adults with SCI. After rescoring 3 items and deleting 1 item, the FAS had good person and item fit (except item 4). The PCAR and subsequent paired -tests (3.53%) confirmed the unidimensionality of the scale. There was no DIF and only one item pair had LID (item 5-6). PSR was 0.75, reflecting a capacity to differentiate groups of people with high or low functionality appreciation levels. However, there was a significant ceiling effect (28.04%) and the person mean location was 3.06 ± 2.07 logits, indicating the FAS is too easy for community-dwelling adults in the US.
The 6-item Rasch-based FAS demonstrated unidimensionality, good item fit (except item 4) and person fit, but the FAS will require more difficult items to be added to improve the targeting of the scale, and better reliability.
功能欣赏量表（FAS）用于衡量个体对自身身体所能执行功能的欣赏程度，而不考虑个体的身体限制。先前的研究报告了其内部一致性、重测信度、收敛效度以及探索性或验证性因素分析，但尚未进行Rasch分析来评估FAS的结构效度。
我们在明尼苏达州博览会上招募了社区居住的成年人，并通过参与明尼苏达大学脑-身-心实验室研究的参与者联系名单进行招募。患有脊髓损伤（SCI）的社区居住成年人通过Zoom完成了FAS。我们使用Rasch测量理论对FAS进行分析，得出以下结果：项目和人员拟合度、目标定位、单维度性、人员分离信度（PSR）、局部项目依赖性（LID）、残差主成分分析（PCAR）以及差异项目功能（DIF）。
我们招募了567名参与者（平均年龄52.15±17.5岁，63.84%为女性），其中14名患有SCI的成年人。在对3个项目重新计分并删除1个项目后，FAS具有良好的人员和项目拟合度（项目4除外）。PCAR及后续配对检验（3.53%）证实了该量表的单维度性。不存在DIF，只有一对项目存在LID（项目5 - 6）。PSR为0.75，反映了区分功能欣赏水平高或低的人群组的能力。然而，存在显著的天花板效应（28.04%），人员平均位置为3.06±2.07对数单位，表明FAS对美国社区居住成年人来说过于简单。
基于Rasch的6项FAS表现出单维度性、良好的项目拟合度（项目4除外）和人员拟合度，但FAS需要添加更具难度的项目以改善量表的目标定位和提高信度。
