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J Formos Med Assoc. 2008 Feb;107(2):111-8. doi: 10.1016/S0929-6646(08)60124-2.

Reliability and validity of the Taiwan Chinese version of the Foot Function Index.

Author information

1
Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.

Abstract

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.

METHODS:

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.

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 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.

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.

PMID:
18285243
DOI:
10.1016/S0929-6646(08)60124-2
[Indexed for MEDLINE]
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