Asian Spine J.  2016 Aug;10(4):719-727. 10.4184/asj.2016.10.4.719.

An Outcome Measure of Functionality and Pain in Patients with Low Back Disorder: A Validation Study of the Iranian version of Low Back Outcome Score

• Azimi P
• Nayeb Aghaei H
• Azhari S
• Shazadi S
• Khayat Kashany H
• Mohammadi
• Montazeri

• KMID: 2349296
• DOI: http://doi.org/10.4184/asj.2016.10.4.719

Abstract

STUDY DESIGN: Cross-sectional study. PURPOSE: This study aimed to cross-culturally translate and validate the low back outcome score (LBOS) in Iran. OVERVIEW OF LITERATURE: Lumbar disc hernia (LDH) is the most common diagnoses of low back pain and imposes a heavy burden on both individual and society. Instruments measuring patient reported outcomes should satisfy cetain psychometric properties.
METHODS
The translation and cross-cultural adaptation of the original questionnaire was performed using Beaton's guideline. A total of 163 patients with LDH were asked to respond to the questionnaire at three points in time: preoperative and twice within 1-week interval after surgery assessments. The Oswestry disabilty index (ODI) was also completed. The internal consistency, test-retest, convergent validity, and responsiveness to change were assessed. Responsiveness to change also was assessed comparing patients' pre- and postoperative scores.
RESULTS
The mean age of the cohort was 49.8 years (standard deviation=10.1). The Cronbach's alpha coefficients for the LBOS at preoperative and postoperative assessments ranged from 0.77 to 0.79, indicating good internal consistency. Test-retest reliability as performed by intraclass correlation coefficient was found to be 0.82 (0.62-0.91). The instrument discriminated well between sub-groups of patients who differed in the Finneson-Cooper score. The ODI correlated strongly with the LBOS score, lending support to its good convergent validity (r=--0.83; p<0.001). Further analysis also indicated that the questionnaire was responsive to change (p<0.001).
CONCLUSIONS
The Iranian version of LBOS performed well and the findings suggest that it is a valid measure of back pain treatment evaluation among LDH patients.

Keyword

Iran; Low back outcome score; Validity; Low back pain

MeSH Terms

Back Pain
Cohort Studies
Cross-Sectional Studies
Diagnosis
Hernia
Humans
Iran
Low Back Pain
Outcome Assessment (Health Care)*
Psychometrics
Reproducibility of Results