Wu S.-H.HUEY-WEN LIANGHou W.-H.2020-03-312020-03-3120080929-6646https://www.scopus.com/inward/record.uri?eid=2-s2.0-40749153155&doi=10.1016%2fS0929-6646%2808%2960124-2&partnerID=40&md5=fb56c01cdec46751f535eb3cf41d017ehttps://scholars.lib.ntu.edu.tw/handle/123456789/482376Background/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. Methods: Fifty plantar fasciitis patients and 29 ankle/foot fracture patients volunteered for the crosssectional 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 α 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 covariate (diagnosis, age, gender, employment) on the scores of total FFI and subscales; was explored by multivaria general linear model analysis. Results: 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 α = 0.94) and the test-retest reliability was satisfactory (ICC = 0.82). The activity limitation subscale had relatively lower Cronbach's α (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. Conclusion: 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. ? 2008 Elsevier & Formosan Medical Association.[SDGs]SDG3adult; age distribution; ankle fracture; article; Chinese; controlled study; correlation coefficient; criterion related validity; disease classification; employment; female; foot fracture; foot function index; foot injury; functional assessment; human; internal consistency; linear system; major clinical study; male; mental performance; multivariate analysis; outcomes research; pain assessment; physical performance; plantar fasciitis; rating scale; scoring system; sex ratio; Short Form 36; Taiwan; test retest reliabilityjournal article10.1016/S0929-6646(08)60124-2182852432-s2.0-40749153155