Development and preliminary psychometric evaluation of the COPD-related Stigma Scale

Abstract

BackgroundStigma experiences contribute to psychological distress and negatively affect healthcare-seeking behavior in people with chronic obstructive pulmonary disease (COPD). Most evidence comes from qualitative research, and no well-established measure of COPD-related stigma exists. Prior research yielded a preliminary measure of COPD-related stigma, but it required item reduction and validation. ObjectivesThe purpose of this study was to revise the preliminary measure, reduce the number of items, identify underlying constructs, and evaluate the reliability and validity of the shortened version. MethodsA descriptive, cross-sectional study was conducted. Participants (N = 148; mean = 64 ± 7.27 years) completed the 51-item preliminary COPD-related Stigma Scale (COPDSS). Item-level analysis was conducted before running exploratory factor analysis (EFA). Reliability was assessed using Cronbach's alpha. Convergent validity and known-groups validity were evaluated. ResultsIn the item-level analysis, eight items were deleted, leaving 43 items for factor analysis. A four-factor model with 24 items (α = 0.93) was derived from EFA: social stigma (α = 0.95), felt stigma (α = 0.95), anticipated stigma-oxygen (α = 0.80), and smoking-related stigma (α = 0.81). The 24-item COPDSS was significantly correlated with the 8-item Stigma Scale for Chronic Illness (r = 0.83), the Hospital Anxiety and Depression Scale (r = 0.57), and the PROMIS Physical Function (r = –0.48). The 24-item COPDSS discriminated between known groups based on age (p = .03), use of inhalers (p = .002) and use of supplemental oxygen (p < .001), and psychological distress levels (ps < .001). ConclusionFindings support the reliability and validity of the 24-item COPDSS. This instrument can be used to understand underlying stigma processes in people with COPD.