title: Association of pruritus with quality of life and disability in systemic sclerosis.
abstract: OBJECTIVE
  To our knowledge, no studies have investigated the association of pruritus, which is present in almost half of patients with systemic sclerosis (SSc; scleroderma), with quality of life (QOL) and disability. The objective of this study was to investigate the association of pruritus with QOL and disability in SSc.
  
  
  METHODS
  We performed a cross-sectional, multicenter study of 578 SSc patients ≥1 year post-enrollment in the Canadian Scleroderma Research Group Registry. Patients reported whether they experienced pruritus during the past month on most days and underwent clinical histories and medical examinations. QOL was measured using the mental and physical component summary scores of the Short Form 36, and disability was measured with the Health Assessment Questionnaire disability index. The association of pruritus with QOL and disability was estimated using linear regression, controlling for sociodemographic and disease variables.
  
  
  RESULTS
  A total of 248 patients (43%) reported pruritus on most days. Patients with pruritus had significantly worse mental (Hedges's g = -0.43; 95% confidence interval [95% CI] -0.59, -0.26) and physical function (Hedges's g = -0.51; 95% CI -0.68, -0.34) and greater disability (Hedges's g = 0.46; 95% CI 0.29, 0.63) than patients without pruritus. In multivariate analyses, controlling for age, sex, marital status, education, disease duration, skin score, number of tender joints, gastrointestinal symptoms, breathing problems, Raynaud's phenomenon, and finger ulcers, pruritus was independently associated with mental (P = 0.017) and physical function (P = 0.003), but not disability (P = 0.112).
  
  
  CONCLUSIONS
  Pruritus is common and associated with QOL in SSc. More attention to pruritus in SSc is needed, including its measurement, etiology, trajectory, and potential methods for intervention.
authors.affiliation: McGill University and Jewish General Hospital, Montreal, Quebec, Canada.
authors.forename: Ghassan
authors.initials: G
authors.lastname: El-Baalbaki
authors.forename: Ilya
authors.initials: I
authors.lastname: Razykov
authors.forename: Marie
authors.initials: M
authors.lastname: Hudson
authors.forename: Marielle
authors.initials: M
authors.lastname: Bassel
authors.forename: Murray
authors.initials: M
authors.lastname: Baron
authors.forename: Brett D
authors.initials: BD
authors.lastname: Thombs
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011537:Pruritus / Q000150:complications / Q000175:diagnosis / Q000523:psychology*; D011788:Quality of Life / Q000523:psychology*; D012042:Registries / Q000706:statistics & numerical data; D015203:Reproducibility of Results; D012595:Scleroderma, Systemic / Q000150:complications / Q000175:diagnosis / Q000523:psychology*