Supplemental Material for: Symons and Fanning Classification in Otosclerosis and its Relation to Audiologic Parameters, Stapes Footplate Thickness, and Round Window Involvement

Radiological classifications and findings correlate heterogeneously with audiometric parameters. The objective of this study was to investigate the inter- and intrarater reliability between two raters of different departments regarding the widely used Symons and Fanning Classification (SFC) and correlate this with further radiological features and audiometric parameter.</p><p dir="ltr">Methods</p><p dir="ltr">This was a retrospective data analysis conducted on 63 surgical confirmed otosclerotic ears from 56 patients in a single tertiary referral center.

Radiological classification and findings were assessed independently by two investigators, a neuroradiologist and ear-, nose and throat specialist, from a preoperative cone beam computed tomography. Inter- and intrarater reliability of the Symons and Fanning classification and its correlation were compared with hearing level, round window involvement, and stapes footplate thickness. </p><p dir="ltr">Results</p><p dir="ltr">Interrater reliability slightly increased over a six-month period and was considered to be weak at both time points.