Results
Among the 173 COM patients (173 ears), ages ranged from 10 to 74 years
(median, 45 years). There were 66 males and 107 females, with a
male/female ratio of 1:1.62, of which 91 (52.6 %) were left ears. Of
the total cohort, hearing in all frequencies improved significantly
postoperatively in AC (Fig 1a) and ABG (Fig 1c) test. BC (Fig 1b)
significantly improved at 500, 1000 and 2000 Hz.
Fig 1 Preoperative and Postoperative frequency-specific hearing results
in AC, BC, and ABG. a, Preoperative and postoperative levels in AC. B,
Preoperative and postoperative levels in BC. C, Preoperative and
postoperative levels in ABG.