Validation of the Injustice Experience Questionnaire (IEQ) in a spinal cord injury population

Abstract

Study design: Retrospective analysis of cross-sectional data.

Objectives: To verify the factor structure of the Injustice Experience Questionnaire (IEQ) using a sample of individuals with spinal cord injury (SCI) and to assess IEQ scale reliability and construct validity using the same population.

Setting: Two SCI rehabilitation sites in the United States.

Methods: Three datasets were combined to conduct this validation study. The sample consisted of 341 adults with SCI who completed the IEQ, measures of psychological distress and pain, and provided sociodemographic and injury-related information. A series of confirmatory factor analyses (CFA) and exploratory factor analyses (EFA) were conducted to verify the two-factor structure of the IEQ, Cronbach's alpha was used to demonstrate scale reliability, and correlations between the IEQ and measures of pain and psychological distress were examined to assess construct validity.

Results: Poor model fit was observed for the two-factor structure of the IEQ as well as for the subsequent factor-structures that were explored. The IEQ demonstrated strong scale reliability (α = 0.89) and correlations between the IEQ and measures of pain and psychological distress were in the expected direction, indicating good construct validity.

Conclusions: In this preliminary validation study, we failed to confirm the two-factor structure of the IEQ in a population of individuals with SCI. Though good scale reliability and construct validity were observed, further study is needed to refine the IEQ for use in this population.