Wu Shih-Huey, Liang Huey-Wen, Hou Wen-Hsuan
Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.
J Formos Med Assoc. 2008 Feb;107(2):111-8. doi: 10.1016/S0929-6646(08)60124-2.
BACKGROUND/PURPOSE: To test the reliability and validity of the Taiwan Chinese version of the Foot Function Index (FFI) among patients with plantar fasciitis and ankle/foot fracture.
Fifty plantar fasciitis patients and 29 ankle/foot fracture patients volunteered for the cross-sectional survey and 24 were re-retested later. The response distribution was compared between the two groups. The internal consistency and test-retest reliability were evaluated by using Cronbach's alpha and intraclass correlation coefficient (ICC). Criterion validity was examined for correlations with the Taiwan version of the Medical Outcomes Study Short Form-36 (SF-36) questionnaire. The influence of covariates (diagnosis, age, gender, employment) on the scores of total FFI and subscales was explored by multivariate general linear model analysis.
Two items in the pain subscale had many answers in the non-applicable category and were removed from analysis. The internal consistency of the 21-item FFI was high (Cronbach's alpha = 0.94) and the test-retest reliability was satisfactory (ICC = 0.82). The activity limitation subscale had relatively lower Cronbach's alpha (0.75) and the items in this subscale had a high proportion of floor scores. There was a moderate correlation between the FFI total and subscale scores to the physical component summary scores rather than to the mental component summary scores of the SF-36. Multivariate general linear model analysis showed that the cases of plantar fasciitis had higher pain scores and lower activity limitation scores, although their FFI total scores were comparable.
The adapted Taiwan Chinese version of the FFI is reliable and valid and can be applied among traumatic and non-traumatic foot disorders. Nevertheless, its clinical application may be limited by a relatively high proportion of non-applicable answers and significant floor effect in some items.
背景/目的：检验中文版台湾版足功能指数（FFI）在足底筋膜炎患者和踝/足部骨折患者中的可靠性和有效性。
50例足底筋膜炎患者和29例踝/足部骨折患者自愿参与横断面调查，其中24例随后进行了重新测试。比较两组的反应分布情况。采用Cronbach's α系数和组内相关系数（ICC）评估内部一致性和重测信度。通过与中文版医学结局研究简明健康调查36项问卷（SF-36）的相关性检验效标效度。采用多变量一般线性模型分析协变量（诊断、年龄、性别、就业情况）对FFI总分及各分量表得分的影响。
疼痛分量表中的两个项目有许多答案属于不适用类别，因此从分析中剔除。21项FFI的内部一致性较高（Cronbach's α = 0.94），重测信度良好（ICC = 0.82）。活动受限分量表的Cronbach's α系数相对较低（0.75），该分量表中的项目地板效应得分比例较高。FFI总分及各分量表得分与SF-36的生理健康综合得分有中度相关性，与心理健康综合得分的相关性较弱。多变量一般线性模型分析显示，尽管足底筋膜炎患者的FFI总分相当，但他们的疼痛得分较高，活动受限得分较低。
改编后的中文版台湾版FFI可靠且有效，可应用于创伤性和非创伤性足部疾病。然而，其临床应用可能受到较高比例的不适用答案以及某些项目中显著地板效应的限制。
