Polish cross-cultural adaptation of the lower limb functional index (LLFI) demonstrates a valid outcome measure for the lower limb region and joints

Bejer, Agnieszka; Bieś, Agnieszka; Kyc, Sylwia; Lorenc, Magdalena; Mataczyński, Piotr; Domka-Jopek, Elżbieta; Melloh, Markus; Gabel, Charles Philip

doi:10.3390/ijerph18189894

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-25885

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Polish cross-cultural adaptation of the lower limb functional index (LLFI) demonstrates a valid outcome measure for the lower limb region and joints
Authors:	Bejer, Agnieszka Bieś, Agnieszka Kyc, Sylwia Lorenc, Magdalena Mataczyński, Piotr Domka-Jopek, Elżbieta Melloh, Markus Gabel, Charles Philip
et. al:	No
DOI:	10.3390/ijerph18189894 10.21256/zhaw-25885
Published in:	International Journal of Environmental Research and Public Health
Volume(Issue):	18
Issue:	9894
Issue Date:	2021
Publisher / Ed. Institution:	MDPI
ISSN:	1660-4601 1661-7827
Language:	English
Subjects:	Lower limb functional index; Outcome measure; Psychometrics; Linguistic adaptation; Poland
Subject (DDC):	490: Other languages 610: Medicine and health
Abstract:	This study aimed to perform linguistic and cross-cultural adaptation to establish a Polish version of the Lower Limb Functional Index (LLFI) as well as an evaluation of the psychometric properties. This was a two-stage, cross-sectional study. The first stage-linguistic and cultural adaptation, complied with the International Society for Pharmacoeconomics and Outcomes Research guidelines to produce the Lower Limb Functional Index, Polish version (LLFI-PL). The subjects were recruited to the second stage of the study from a sample of convenience (n = 125, age x- = 52.86 ± 19.53 years, 56% female, symptoms duration x- = 17.69 ± 18.39 weeks). Baseline reliability was performed on the LLFI-PL with retest period at 3-7 days. The Western Ontario and McMaster University Osteoarthritis Index (WOMAC), EuroQol Health Questionnaire 5-Dimensions 5-Level (EQ-5D-5L), and an 11-point Pain Numerical Rating Scale (P-NRS) were completed to assess the validity of the LLFI-PL. Statistical analysis showed high internal consistency (α = 0.94), and excellent test-retest reliability (ICC2.1 = 0.96). The measurement error was SEM = 1.69% with MDC90 = 3.93%. Construct validity demonstrated strong correlations between the LLFI-PL and WOMAC (r = 0.81) and moderate correlations with the EQ-5D-5L (r = -0.63) and P-NRS (r = -0.39). Exploratory factor analysis confirmed a single-factor structure. The LLFI-PL is a psychometrically sound questionnaire for Polish-speaking patients with lower limb musculoskeletal conditions. The results support findings from the previous original English, Spanish, and Turkish versions.
URI:	https://digitalcollection.zhaw.ch/handle/11475/25885
Fulltext version:	Published version
License (according to publishing contract):	CC BY 4.0: Attribution 4.0 International
Departement:	School of Health Sciences
Organisational Unit:	Institute of Public Health (IPH)
Appears in collections:	Publikationen Gesundheit

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Bejer, A., Bieś, A., Kyc, S., Lorenc, M., Mataczyński, P., Domka-Jopek, E., Melloh, M., & Gabel, C. P. (2021). Polish cross-cultural adaptation of the lower limb functional index (LLFI) demonstrates a valid outcome measure for the lower limb region and joints. International Journal of Environmental Research and Public Health, 18(9894). https://doi.org/10.3390/ijerph18189894

Bejer, A. et al. (2021) ‘Polish cross-cultural adaptation of the lower limb functional index (LLFI) demonstrates a valid outcome measure for the lower limb region and joints’, International Journal of Environmental Research and Public Health, 18(9894). Available at: https://doi.org/10.3390/ijerph18189894.

A. Bejer et al., “Polish cross-cultural adaptation of the lower limb functional index (LLFI) demonstrates a valid outcome measure for the lower limb region and joints,” International Journal of Environmental Research and Public Health, vol. 18, no. 9894, 2021, doi: 10.3390/ijerph18189894.

BEJER, Agnieszka, Agnieszka BIEŚ, Sylwia KYC, Magdalena LORENC, Piotr MATACZYŃSKI, Elżbieta DOMKA-JOPEK, Markus MELLOH und Charles Philip GABEL, 2021. Polish cross-cultural adaptation of the lower limb functional index (LLFI) demonstrates a valid outcome measure for the lower limb region and joints. International Journal of Environmental Research and Public Health. 2021. Bd. 18, Nr. 9894. DOI 10.3390/ijerph18189894

Bejer, Agnieszka, Agnieszka Bieś, Sylwia Kyc, Magdalena Lorenc, Piotr Mataczyński, Elżbieta Domka-Jopek, Markus Melloh, and Charles Philip Gabel. 2021. “Polish Cross-Cultural Adaptation of the Lower Limb Functional Index (LLFI) Demonstrates a Valid Outcome Measure for the Lower Limb Region and Joints.” International Journal of Environmental Research and Public Health 18 (9894). https://doi.org/10.3390/ijerph18189894.

Bejer, Agnieszka, et al. “Polish Cross-Cultural Adaptation of the Lower Limb Functional Index (LLFI) Demonstrates a Valid Outcome Measure for the Lower Limb Region and Joints.” International Journal of Environmental Research and Public Health, vol. 18, no. 9894, 2021, https://doi.org/10.3390/ijerph18189894.