Reliability and validity of the Taiwan Chinese version of the foot function index

Shih Huey Wu, Huey Wen Liang, Wen Hsuan Hou

Research output: Contribution to journalArticle

35 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)111-118
Number of pages8
JournalJournal of the Formosan Medical Association = Taiwan yi zhi
Volume107
Issue number2
DOIs
Publication statusPublished - Feb 2008
Externally publishedYes

Fingerprint

Taiwan
Reproducibility of Results
Foot
Plantar Fasciitis
Ankle Fractures
Linear Models
Pain
Outcome Assessment (Health Care)

Keywords

  • Ankle fracture
  • Foot fracture
  • Outcome assessment
  • Plantar fasciitis
  • Questionnaires

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Reliability and validity of the Taiwan Chinese version of the foot function index. / Wu, Shih Huey; Liang, Huey Wen; Hou, Wen Hsuan.

In: Journal of the Formosan Medical Association = Taiwan yi zhi, Vol. 107, No. 2, 02.2008, p. 111-118.

Research output: Contribution to journalArticle

@article{1b2c2f4401a240e8bb5a37d90a8415f5,
title = "Reliability and validity of the Taiwan Chinese version of the foot function index",
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 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.",
keywords = "Ankle fracture, Foot fracture, Outcome assessment, Plantar fasciitis, Questionnaires",
author = "Wu, {Shih Huey} and Liang, {Huey Wen} and Hou, {Wen Hsuan}",
year = "2008",
month = "2",
doi = "10.1016/S0929-6646(08)60124-2",
language = "English",
volume = "107",
pages = "111--118",
journal = "Journal of the Formosan Medical Association",
issn = "0929-6646",
publisher = "Elsevier Science Publishers B.V.",
number = "2",

}

TY - JOUR

T1 - Reliability and validity of the Taiwan Chinese version of the foot function index

AU - Wu, Shih Huey

AU - Liang, Huey Wen

AU - Hou, Wen Hsuan

PY - 2008/2

Y1 - 2008/2

N2 - 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 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.

AB - 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 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.

KW - Ankle fracture

KW - Foot fracture

KW - Outcome assessment

KW - Plantar fasciitis

KW - Questionnaires

UR - http://www.scopus.com/inward/record.url?scp=40749153155&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=40749153155&partnerID=8YFLogxK

U2 - 10.1016/S0929-6646(08)60124-2

DO - 10.1016/S0929-6646(08)60124-2

M3 - Article

C2 - 18285243

AN - SCOPUS:40749153155

VL - 107

SP - 111

EP - 118

JO - Journal of the Formosan Medical Association

JF - Journal of the Formosan Medical Association

SN - 0929-6646

IS - 2

ER -