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The Rhinoplasty Rosetta Stone: Using Rasch Analysis to Create and Validate Crosswalks between the NOSE and the SCHNOS
Floris V W J van Zijl1, Frank Declau2, Dimitris Rizopoulos3
1From the Departments of Otorhinolaryngology and Head and Neck Surgery.
Plastic and Reconstructive Surgery
|March 29, 2024
Summary
This study created validated crosswalks between the Nasal Obstruction Symptom Evaluation (NOSE) and SCHNOS-O instruments. These tools now allow for harmonized comparison of rhinoplasty functional outcomes.
Area of Science:
- Plastic Surgery
- Patient-Reported Outcome Measures
Background:
- Nasal Obstruction Symptom Evaluation (NOSE) and SCHNOS-O are key for rhinoplasty outcomes.
- Disparate metrics hinder direct comparison of data from these instruments.
- Harmonizing data is crucial for aggregating rhinoplasty outcome research.
Purpose of the Study:
- Develop and validate crosswalks between NOSE and SCHNOS-O.
- Enable direct comparison of functional outcomes in rhinoplasty.
- Facilitate data aggregation across different patient-reported outcome measures.
Main Methods:
- Rasch analysis co-calibrated NOSE and SCHNOS-O scales on a common metric.
- 552 rhinoplasty patients completed both instruments for initial calibration.
- A second independent sample validated the developed crosswalks.
Main Results:
- Strong correlation observed between NOSE and SCHNOS-O total scores.
- Rasch model demonstrated adequate fit to the data.
- Crosswalk tables showed high agreement (ICC=0.93) for group-level comparisons.
Conclusions:
- Rasch-based crosswalks between NOSE and SCHNOS-O were successfully developed and validated.
- These crosswalks facilitate comparison and harmonization of functional rhinoplasty outcomes.
- The findings support broader data aggregation in rhinoplasty research.
