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Research Letter
Nov/Dec 2018

Psychometric Properties of the Standardized Cosmesis and Health Nasal Outcomes Survey: Item Response Theory Analysis

Author Affiliations
  • 1Department of Physical and Rehabilitation Medicine, Turku University Hospital, University of Turku, Turku, Finland
  • 2Division of Facial Plastic and Reconstructive Surgery, Department of Otolaryngology–Head and Neck Surgery, Stanford University School of Medicine, Stanford, California
  • 3Department of Otorhinolaryngology, Mansoura University, Mansoura, Egypt
  • 4Division of Otolaryngology–Head and Neck Surgery, Department of Surgery, Université de Montréal, Montréal, Québec, Canada
JAMA Facial Plast Surg. 2018;20(6):519-521. doi:10.1001/jamafacial.2018.0626

The Standardized Cosmesis and Health Nasal Outcomes Survey (SCHNOS) is a new 10-item questionnaire to evaluate the functional and cosmetic outcomes of rhinoplasty.1 The SCHNOS produces 2 scores: obstruction (SCHNOS-O; items 1-4) and cosmesis (SCHNOS-C; items 5-10). The exact psychometric characteristics of the SCHNOS are unknown.1 To confirm that patients with greater symptom severity have a higher probability of achieving a higher score on a questionnaire, a self-administered test can be evaluated by a Rasch or item response theory (IRT) analysis.2 Our objective was to evaluate the psychometric properties of the SCHNOS using IRT analysis to determine its ability to discriminate among different levels of symptom severity and to evaluate its performance at different severity levels.