Validation of a Spanish version of the Spine Functional Index

Cuesta-Vargas, Antonio & Gabel, Charles (2014) Validation of a Spanish version of the Spine Functional Index. Health and Quality of Life Outcomes, 12(96), pp. 1-8.

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The Spine Functional Index (SFI) is a recently published, robust and clinimetrically valid patient reported outcome measure.


The purpose of this study was the adaptation and validation of a Spanish-version (SFI-Sp) with cultural and linguistic equivalence.


A two stage observational study was conducted. The SFI was cross-culturally adapted to Spanish through double forward and backward translation then validated for its psychometric characteristics. Participants (n = 226) with various spine conditions of >12 weeks duration completed the SFI-Sp and a region specific measure: for the back, the Roland Morris Questionnaire (RMQ) and Backache Index (BADIX); for the neck, the Neck Disability Index (NDI); for general health the EQ-5D and SF-12. The full sample was employed to determine internal consistency, concurrent criterion validity by region and health, construct validity and factor structure. A subgroup (n = 51) was used to determine reliability at seven days.


The SFI-Sp demonstrated high internal consistency (α = 0.85) and reliability (r = 0.96). The factor structure was one-dimensional and supported construct validity. Criterion specific validity for function was high with the RMQ (r = 0.79), moderate with the BADIX (r = 0.59) and low with the NDI (r = 0.46). For general health it was low with the EQ-5D and inversely correlated (r = −0.42) and fair with the Physical and Mental Components of the SF-12 and inversely correlated (r = −0.56 and r = −0.48), respectively. The study limitations included the lack of longitudinal data regarding other psychometric properties, specifically responsiveness.


The SFI-Sp was demonstrated as a valid and reliable spine-regional outcome measure. The psychometric properties were comparable to and supported those of the English-version, however further longitudinal investigations are required.

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ID Code: 88729
Item Type: Journal Article
Refereed: Yes
DOI: 10.1186/1477-7525-12-96
ISSN: 1477-7525
Divisions: Current > Schools > School of Clinical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Copyright Owner: Copyright 2014 Cuesta-Vargas and Gabel; licensee BioMed Central Ltd.
Copyright Statement: This is an Open Access article distributed under the terms of
the Creative Commons Attribution License (, which permits unrestricted use,
distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public
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Deposited On: 30 Oct 2015 00:43
Last Modified: 30 Oct 2015 00:43

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