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1dB HL (postoperatively). In studies that presented combined adult and pediatric data, the mean preoperative air-bone gap of 26.7dB HL was closed to 15.4dB HL. In 1370 patients with synthesizable data, 70.7% of patients had a postoperative air-bone gap ˂ 20 dB HL at long-term follow-up. Finally, subgroup analysis identified that mean improvement in ABG closure for patients with and without cholesteatoma was 10.0dB HL and 12.4dB HL, respectively. In patients with chronic otitis media, tympanoplasty successfully closed the air-bone gap t