title: Psychometric Properties of the Centrality of Pain Scale.
abstract: The Centrality of Pain Scale (COPS) is a recently developed patient-centered, 10-item self-report measure designed to assess how central, or dominating, in their lives individuals with chronic pain perceive pain to be. The COPS underwent initial development and validation previously; preliminary results suggested that the measure had excellent psychometric properties and that COPS scores were associated with important clinical factors. The purpose of the present study was to examine the psychometric properties of the COPS in a sample of individuals with mixed chronic pain diagnoses (N = 178) being treated at a U.S. Veterans Affairs Medical Center. Principal components analysis of COPS items revealed a single factor, and all items loaded highly. The COPS had high internal consistency (Cronbach's alpha = .902) and was significantly correlated with other measures of pain, mental health, psychological factors associated with pain, and chronic pain coping styles, suggesting convergent and divergent validity. Hierarchical linear regression analyses indicated that COPS score was independently associated with both pain severity and interference. Future research should evaluate the generalizability of the COPS in different samples, its responsiveness to treatment, and the extent to which pain centrality may be a focus of nonpharmacologic interventions for chronic pain.
  
  
  CONCLUSIONS
  We conducted psychometric testing of the COPS, a recently developed patient-centered self-report measure designed to examine how central or dominating pain is to a person's life. Study results indicated a reliable and valid measure, which was significantly associated with pain severity and interference, even after controlling for demographic and clinical factors.
authors.affiliation: Center to Improve Veteran Involvement in Care, VA Portland Health Care System, Portland, Oregon; Department of Psychiatry, Oregon Health & Science University, Portland, Oregon. Electronic address: benjamin.morasco@va.gov.
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Morasco
authors.affiliation: Department of Anesthesiology and Pain Medicine and Center for Pain Research on Impact, Measurement, & Effectiveness, University of Washington, Seattle, Washington.
authors.forename: Dennis C
authors.initials: DC
authors.lastname: Turk
authors.affiliation: Regional Research Institute, School of Social Work, Portland State University, Portland, Oregon; Department of Medicine and Public Health & Preventive Medicine, Oregon Health & Science University, Portland, Oregon.
authors.forename: Christina
authors.initials: C
authors.lastname: Nicolaidis
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000175:diagnosis* / Q000523:psychology*; D010147:Pain Measurement / Q000379:methods*; D025341:Principal Component Analysis; D011594:Psychometrics; D057566:Self Report
keywords: Pain centrality; biopsychosocial model; chronic pain; patient-centered care; reliability; validity