The Rhinoplasty Rosetta Stone: using Rasch analysis to create and validate crosswalks between the NOSE and SCHNOS functional subscale

The NOSE and SCHNOS functional subscale are widely used PROMs to measure functional outcomes of rhinoplasty. However, as different instruments produce scores on different metrics, results of these instruments cannot be linked directly. This hinders comparing and aggregating rhinoplasty outcome data from practices using either instrument. The aim of this study was to develop and validate crosswalks between the NOSE and SCHNOS-O.