Translation, adaptation and validation of the Moroccan version of the Quebec Back Pain Disability Scale.
ABSTRACT This study aims to translate and cross-culturally adapt the Moroccan version of the Quebec Back Pain Disability Scale (QDS) and to investigate its reliability and validity in Moroccan patients with low back pain (LBP). The translation and cross-cultural adaptation of the QDS were developed in agreement with published guidelines. The QDS was translated by use of the forward and backward translation procedure. After pretest, it was validated in 64 Moroccan patients with LBP. The QDS was recorded twice, at baseline visit and 72 h later. Reproducibility was evaluated using intraclass correlation coefficient (ICC) and Bland and Altman method. Internal consistency was measured by Cronbach α coefficient. Ceiling and floor effects were assessed. Validity was measured by correlating the scores of the Moroccan QDS with visual analogue scale (VAS) for Pain, Disability VAS, Schober test, fingertip-floor measurement and the Moroccan version of the Roland Morris Disability Questionnaire (RMDQ) by means of the Spearman rank correlation coefficient. Association with gender and education level was also studied. Reliability was excellent with an ICC (type 2.1) of 0.959 (CI 95%: 0.934-0.975). The internal consistency was high with a Cronbach α of 0.979. The Bland and Altman method showed homogenous distribution of the differences, with no systematic trend. There were no floor or ceiling effects. The correlation between QDS and RMDQ was very good (r = 0.664; p ≤ 0.001). There was no correlation between QDS and the other variables. Accordingly, the Moroccan version of QDS has good reproducibility, internal consistency and validity for the assessment of disability in Moroccan-speaking patients with LBP.
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ABSTRACT: A prospective cohort design was used to evaluate the Functional Rating Index in a multicentered setting with 139 participants. The Functional Rating Index is a self-reporting instrument consisting of 10 items, each with 5 possible responses that express graduating degrees of disability. The goal of this study was to evaluate the psychometric qualities of the Functional Rating Index. The Functional Rating Index combines the concepts of the Oswestry Low Back Disability Questionnaire and the Neck Disability Index and seeks to improve on clinical utility (time required for administration). One hundred thirty-nine subjects with spinal complaints participated in four different cohorts to study reliability, validity, responsiveness, and clinical utility. Reliability: Test-retest: Intraclass correlation coefficient was excellent (ICC3,k = 0.99); interitem correlation: Item efficiency was good, ranging between 0.54 and 0.82, with a moderate correlation among all items; Cronbach's alpha was excellent (0.92). Validity: construct: The Functional Rating Index correlated with the Disability Rating Index (0.76), the Short Form-12 Physical Component Score (0.76), and the Short Form-12 Mental Component Score (0.36). Responsiveness: Overall, the size effect was 1.24, which is commendable. Clinical utility: Time required by the patient and staff averaged 78 seconds per administration, which is noteworthy. Effect of Sociodemographics: Total scores were not affected by education, gender, nor age, suggesting minimal external validity bias. The Functional Rating Index appears to be psychometrically sound with regard to reliability, validity, and responsiveness and is clearly superior to other instruments with regard to clinical utility. The Functional Rating Index is a promising useful instrument in the assessment of spinal conditions.Spine 02/2001; 26(1):78-86; discussion 87. · 2.16 Impact Factor
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ABSTRACT: Cross-cultural adaptation and cross-sectional psychometric testing. To translate and culturally adapt the Moroccan version of the Roland Morris Disability Questionnaire and to validate its use for assessing disability in Moroccan patients with low back pain (LBP). The RMDQ is a reliable evaluation instrument for LBP disability, but no validated Moroccan version is available. The RMDQ was translated and back-translated to dialectal Arabic, pretested, and reviewed by a committee following the Guillemin criteria. It was then validated on 76 Moroccan patients with chronic LBP. Reliability for the 1-week test-retest was assessed using internal consistency by Cronbach's alpha coefficient, the intraclass correlation coefficient, and the constructed Bland Altman plot. Structure validity was evaluated by multiple correspondence analysis. External construct validity was assessed by association with pain, spinal mobility, and other key variables (weight, height, duration of LBP). The reproducibility of the 24 items was satisfactory with a kappa statistic of agreement superior to 0.6 except item 10 and ranging from 0.47 to 0.9. The intraclass correlation coefficient for global score reproducibility was good and reached 0.93 (95% confidence interval, 0.89-0.95). The constructed Bland and Altman plot for test-retest agreement showed a good reliability. The internal consistency was very good with a Cronbach's alpha coefficient of 0.96. The multiple correspondence analysis for internal structure validity showed a preponderant factor explaining 22% of the variance in the score. The construct validity showed a positive correlation between RMDQ and the visual analog scale (r = 0.32; P = 0.005). There was no statistic correlation between RMDQ and the other variables. The Moroccan version of the RMDQ has good comprehensibility internal consistency, reliability, and validity for the evaluation of Moroccan-speaking patients with LBP.Spine 07/2007; 32(13):1461-5. · 2.16 Impact Factor
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ABSTRACT: The Dallas Pain Questionnaire (DPQ) was developed to assess the amount of chronic spinal pain that affects four aspects (daily and work-leisure activities, anxiety-depression, and social interest) of the patients' lives. Results of the DPQ's statistical properties suggest that the DPQ is an externally reliable instrument as well as internally consistent. Two factors emerged from factor structure analysis. Factor 1 represents functional activities and Factor 2 represents emotional capacities. A correlation analysis suggests the concurrent validity of the psychological functional factors of the DPQ. A t test demonstrated that chronic pain patients have significantly higher DPQ scores than normals. Because these findings support its statistical properties, the DPQ appears to have utility for clinical and research purposes. The findings, limitations, and implications of this study are detailed, as are suggestions for future research.Spine 06/1989; 14(5):511-6. · 2.16 Impact Factor