title: Determinants of discordance between patients and physicians in their assessment of lupus disease activity.
abstract: OBJECTIVE
  We evaluated different methods for quantifying patient-physician discordance and identified factors associated with discordance in the assessment of lupus disease activity.
  
  
  METHODS
  Data from 208 female patients who had a comprehensive annual examination were extracted from the Montreal General Hospital Lupus Registry. Discordance was measured by the difference between the patient self-reported 10 cm visual analog scale (VAS) and the physician VAS for global disease activity (VASDIFF). Multiple linear regression was used to identify the correlates of discordance, e.g., SF-36TM scales, Systemic Lupus Activity Measure (SLAM) components, etc. Four regression models were estimated using: (1) all patients; (2) only patients who evaluated disease activity higher than their physician's assessment; (3) only patients who evaluated disease activity lower than their physician's assessment; and (4) all patients, with the absolute value of VASDIFF as the dependent variable.
  
  
  RESULTS
  Of the 208 observations, 150 (72%) of the VASDIFF scores were within +/- 2.5 cm on a 10 cm scale, indicating absence of marked discordance; 43 (20.7%) were from patients overscoring and 15 (7.2%) from patients underscoring their physician by at least 2.5 cm. Higher SF-36 role physical score, more bodily pain, and lower role emotional score in addition to the SLAM-skin component were independently associated with higher discordance. SF-36 social function and mental health scores as well as SLAM-neurological and kidney components were correlated with discordance in some subanalyses. Bodily pain was the most important variable for predicting "clinically relevant" discordance, followed by SLAM-skin and kidney components.
  
  
  CONCLUSIONS
  Discordance between patients and physicians may result from patients scoring their disease activity based on their psychological and physical well-being, whereas physicians score disease activity based on the clinical and physical signs and symptoms of lupus.
authors.affiliation: Division of Clinical Epidemiology, The McGill University Health Centre, Montreal, Quebec, Canada.
authors.forename: Jim C
authors.initials: JC
authors.lastname: Yen
authors.forename: Michal
authors.initials: M
authors.lastname: Abrahamowicz
authors.forename: Patricia L
authors.initials: PL
authors.lastname: Dobkin
authors.forename: Ann E
authors.initials: AE
authors.lastname: Clarke
authors.forename: Renaldo N
authors.initials: RN
authors.lastname: Battista
authors.forename: Paul R
authors.initials: PR
authors.lastname: Fortin
mesh_terms: D000328:Adult; D015331:Cohort Studies; D018450:Disease Progression; D005260:Female; D006801:Humans; D016015:Logistic Models; D008180:Lupus Erythematosus, Systemic / Q000175:diagnosis* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009864:Ontario; D010358:Patient Participation; D017060:Patient Satisfaction; D010817:Physician-Patient Relations; D011379:Prognosis; D011788:Quality of Life; D012042:Registries; D012720:Severity of Illness Index; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires