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The Italian version of the Quebec Back Pain Disability Scale: cross-cultural adaptation, reliability and validity in patients with chronic low back pain

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Abstract

Background and aim

Growing attention is being given to physical functioning measures to assess interventions for low back pain (LBP). The Quebec Back Pain Disability Questionnaire (QBPDS) has never been validated in Italian patients, and the aim of the study was culturally adapting and validating the Italian version of the QBPDS (QBPDS-I), to allow its use with Italian-speaking patients with chronic LBP.

Methods

The QBPDS-I was developed by means of forward–backward translation, a final review by an expert committee and a test of the prefinal version to evaluate its comprehensibility. The psychometric testing included structural validity by exploratory factor analysis (EFA), reliability by internal consistency (Cronbach’s alpha) and test–retest reliability (intraclass correlation coefficient, ICC 2.1), measurement error by calculating the minimum detectable change (MDC), construct validity by assessing hypotheses of QBPDS correlations with the Roland Morris Disability Scale (RMDQ), the Oswestry Disability Questionnaire (ODI) and a pain numerical rating scale (NRS) (Spearman’s correlations).

Results

It took one month to develop a consensus-based version of the QBPDS-I. The questionnaire was administered to 201 subjects with chronic LBP and was well accepted. EFA suggested a one-factor 20-item solution (first factor variance explained = 54.7%). Internal consistency (α = 0.95) and test–retest reliability (ICC = 0.90) were excellent. The MDC was 12 scale points. Construct validity was good as all of the hypotheses were met; correlations: RMDQ (r = 0.40), ODI (r = 0.48) and NRS (r = 0.44).

Conclusions

The QBPDS-I is unidimensional, reliable and valid in patients with chronic LBP. Its use is recommended for clinical and research purposes.

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Acknowledgements

The authors would like to thank all of the subjects who got involved into the study. The research activities of Frigau Luca described in this paper have been conducted within the R&D Project Cagliari2020, partially funded by the Italian University and Research Ministry (Grant No. MIUR PON04a2 00381).

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Correspondence to Marco Monticone.

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The study was approved by our hospital’s Institutional Review Board and was conducted in accordance with ethical and humane principles of research.

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Appendix: Quebec Back Pain Disability Scale

Appendix: Quebec Back Pain Disability Scale

Il presente questionario intende valutare in che modo il mal di schiena influenza la tua vita quotidiana. Soggetti con problemi alla schiena possono trovare difficoltà a svolgere alcune attività di ogni giorno. Pertanto, vorremmo sapere se a causa della tua schiena hai difficoltà a svolgere alcune delle attività descritte di seguito. Per ogni attività è possibile rispondere da 0 a 5. Per cortesia, scegli una risposta per ogni attività (senza saltarne nessuna) cerchiando il numero corrispondente.

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Monticone, M., Frigau, L., Mola, F. et al. The Italian version of the Quebec Back Pain Disability Scale: cross-cultural adaptation, reliability and validity in patients with chronic low back pain. Eur Spine J 29, 530–539 (2020). https://doi.org/10.1007/s00586-019-06153-4

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