International Rhinologic Society Rhinology 0300-0729 2026 03 23 Development and psychometric validation of the Chronic Rhinosinusitis Control Test EN R.A. Cotter Department of Otolaryngology – Head and Neck Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA C.W. Lee Department of Otolaryngology – Head and Neck Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA K. Wilson Department of Otolaryngology – Head and Neck Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA S.F. Althoff University of Nevada, Reno School of Medicine, Reno, NV, USA S. AlsalehDepartment of Otolaryngology - Head and Neck Surgery, King Saud University, Riyadh, Saudi Arabia Security Forces Hospitals Program, General Directorate of Medical Services, Ministry of Interior, Riyadh, Saudi Arabia W.T. Anselmo-Lima Division of Otorhinolaryngology, Department of Ophthalmology, Otorhinolaryngology, Head and Neck Surgery, Ribeirao Preto Medical School-University of Sao Paulo, Sao Paulo, Brazil M. Bernal-Sprekelsen Department of ORL, Hospital Clinic, University of Barcelona, Barcelona Spain R.K. Chandra Department of Otolaryngology – Head and Neck Surgery, University of Mississippi Medical Center, Jackson, MS, USA J. Constantinidis 1st Department of ORL, Head and Neck Surgery, Aristotle University, AHEPA Hospital, Thessaloniki, Greece W.J. Fokkens Department of Otorhinolaryngology and Head and Neck Surgery, Amsterdam Medical Center, University of Amsterdam, Amsterdam, the Netherlands A.A. Halderman Department of Otolaryngology Head and Neck Surgery, Westchester Medical Center Health Network, Valhalla, NY, USA T. Herzog Department of Asian, East European and German Studies, University of Cincinnati, Cincinnati, OH, USA C. Hopkins Department of Otolaryngology and Head Neck Surgery, Guys and St Thomas’ Hospital, London, UK E.C. Kuan Department of Otolaryngology – Head and Neck Surgery, University of California, Irvine, Orange, CA, USA B.N. Landis Rhinology-Olfactology Unit, Otorhinolaryngology Department, University Hospital of Geneva, Geneva, Switzerland V.J. Lund Royal National ENT Hospital, University College London Hospital NHS Foundation Trust, London, UK J.C. MeierUniversity of Nevada, Reno School of Medicine, Reno, NV, USA Nevada ENT and Hearing Associates, Reno, NV, USA H.K. Pae School of Education, University of Cincinnati, Cincinnati, OH, USA S.D. Pletcher Department of Otolaryngology – Head and Neck Surgery, University of California San Francisco, San Francisco, CA, USA S. Reitsma Department of Otorhinolaryngology and Head and Neck Surgery, Amsterdam Medical Center, University of Amsterdam, Amsterdam, the Netherlands J. RimmerDepartment of Otolaryngology Head and Neck Surgery, Monash Health, Melbourne, Australia Department of Surgery, Monash University, Melbourne, Australia Department of Otolaryngology Head and Neck Surgery, St Vincent’s Hospital Melbourne, Melbourne, Australia Y.S. Gonzalez School of Education, University of Cincinnati, Cincinnati, OH, USA M.B. SoykaDepartment of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zurich, University of Zurich, Zurich, Switzerland Faculty of Medicine, University of Zurich, Zurich, Switzerland J. Sun Crane Center for Early Childhood Research and Policy, The Ohio State University, Columbus, OH, USA S. Toppila-SalmiDepartment of Otorhinolaryngology, University of Eastern Finland, Joensuu and Kuopio, Finland Wellbeing services county of Pohjois-Savo, Kuopio, Finland Department of Allergology, Inflammation Center, Helsinki University Hospital and University of Helsinki, Helsinki, Finland E.W. Wang Department of Otolaryngology – Head and Neck Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA, USA M.B. Wang Department of Head and Neck Surgery, University of California Los Angeles, Los Angeles, CA, USA B.A. Woodworth Department of Otolaryngology, University of Alabama at Birmingham, Birmingham, AL, USA S.T. Gray Department of Otolaryngology – Head and Neck Surgery, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA P.H. Hwang Department of Otolaryngology – Head and Neck Surgery, Stanford University School of Medicine, Stanford, CA, USA S.K. Wise Department of Otolaryngology, Emory University, Atlanta, GA, USA K.M. Phillips Department of Otolaryngology – Head and Neck Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA A.R. Sedaghat Department of Otolaryngology – Head and Neck Surgery, University of Cincinnati College of Medicine, Cincinnati, OH, USA Journal Article 3388 10.4193/Rhin25.377 BACKGROUND: Disease control assessment for chronic rhinosinusitis (CRS) remains a challenge. In this study, we develop and psychometrically validate a new patient-reported outcome measure, the Chronic Rhinosinusitis Control Test (CRCT), for assessing CRS control. METHODOLOGY: The CRCT, which includes 8 items and has a score that ranges from 0 – 31, incorporates the perspectives of key stakeholders (patients and healthcare providers) and was developed incorporating methodologic guidance from the COSMIN initiative and United States Food and Drug Administration. Psychometric validation was performed in line with recommendations from the COSMIN initiative to establish validity, reliability and responsiveness in a sample of 545 CRS patients and with the participation of 23 expert rhinologists. RESULTS: The CRCT has excellent face validity, content validity, concurrent validity, internal consistency, test-retest reliability, and responsiveness. Factor analysis reveals that the CRCT has 2 subdomains: sinonasal and impairment subdomains in addition to a final item related to CRS-related oral corticosteroid usage in the past 3 months. Using a distribution-based and multiple anchorbased methods, the CRCT has a minimal clinically important difference (MCID) of 4 points. After 23 expert rhinologists independently classified all possible combinations of scoring on the CRCT, scores of ≤7 indicate controlled CRS, 8 to 15 (inclusive) partly controlled CRS and ≥16 uncontrolled CRS. CONCLUSION: The CRCT is a psychometrically validated measure of CRS control. CRS may be classified as controlled based on CRCT score ≤7, partly controlled with CRCT score of 8 to 15 (inclusive) and uncontrolled with CRCT score ≥16. The MCIDs for improvement and worsening are both 4.