Perceived injustice in fibromyalgia: Psychometric characteristics of the Injustice Experience Questionnaire and relationship with pain catastrophising and pain acceptance

Baltasar Rodero, Juan V. Luciano, Jesús Montero-Marín, Benigno Casanueva, Juan Carlos Palacin, Margalida Gili, Yolanda López del Hoyo, Antoni Serrano-Blanco, Javier Garcia-Campayo*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

96 Citations (Scopus)

Abstract

Objective: To validate a Spanish version of the Injustice Experience Questionnaire (IEQ), a measure of perceived injustice, in a fibromyalgia sample and to examine its relationship with pain catastrophising and pain acceptance. Methods: The IEQ was administered along with the Pain Visual Analogue Scale, the Fibromyalgia Impact Questionnaire, the Hospital Anxiety and Depression Scale, the Pain Catastrophizing Scale (PCS) and the Chronic Pain Acceptance Questionnaire (CPAQ) to 250 primary care patients with fibromyalgia. Results: The IEQ had good test-retest reliability (intraclass correlation coefficient=0.98) and internal consistency (Cronbach's α=0.92). The factor structure obtained was similar to the original validation study. The multiple regression analyses showed that perceived injustice (PI) accounted for significant pain-related outcomes after controlling pain intensity, PCS and CPAQ. Principal component analysis of both the IEQ and the CPAQ taken together showed that the two constructs do not represent opposite extremes of the same dimension. Conclusion: The IEQ is a reliable assessment tool for measuring PI among patients with fibromyalgia. PI seems to be distinct from catastrophising, although the two constructs are very similar. The factor analysis showed that PI and acceptance represent related constructs, and this entails relevant implications for therapy, as acceptance-based interventions would be appropriate.

Original languageEnglish
Pages (from-to)86-91
Number of pages6
JournalJournal of Psychosomatic Research
Volume73
Issue number2
DOIs
Publication statusPublished - Aug 2012

Keywords

  • Fibromyalgia
  • Pain acceptance
  • Pain catastrophising
  • Perceived injustice

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