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

Marco Monticone*, Luca Frigau, Francesco Mola, Barbara Rocca, Franco Franchignoni, Salvatore Simone Vullo, Calogero Foti, Alessandro Chiarotto

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

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. Graphic abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)530-539
Number of pages10
JournalEuropean Spine Journal
Volume29
Issue number3
Early online date26 Sep 2019
DOIs
Publication statusPublished - 1 Mar 2020

Keywords

  • Chronic low back pain
  • Cross-cultural adaptation
  • Reliability
  • Sensitivity to change
  • Validity

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