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Table 2 Pre-op and post-op mean air-bone gap

From: Microwave ablation eustachian tuboplasty: a preliminary investigation with long-term follow-up

Patient No. Side of ear Pre-op audiogram findings Mean ABG (dB HL)
Pre-op Post-op 6 m Post-op 30 m
1 Right CHL 28.25 14.75 9.25
2 Right CHL 31.25 29.75 12.25
3 Right CHL 29.75 10.25 6.0
4 Left CHL 22.5 11.25 7.25
5 Right CHL 26.25 26.5 17.25
6 Left CHL 22.5 12.75 6.25
7 Left CHL 26.75 20.25 11.25
8 Left Mixed HL 28.5 21.25 10.75
9 Left CHL 28.25 25.5 22.25
10 Right CHL 29.75 18.55 10.25
11 Right CHL 35.25 33.25 20.75
12 Right CHL 37.5 28.5 11.25
13 Left CHL 26.25 33.25 33.75
14 Right CHL 25.75 20.5 9.25
15 Right CHL 31.25 13.5 7.25
16 Right CHL 32.25 11.25 10.5
17 Left CHL 24.75 10.25 10.25
18 Left CHL 29.25 8.75 8.25
Mean (SD)    28.7 (2.9) 19.7 (7.3) 12.8 (5.5)
  1. Mean air–bone gap was calculated from findings at 0.5, 1, 2 and 3/4 kHz. Only changes in mean air–bone gap of 5 dB HL or more were considered significant because of inter-test variability
  2. Pre-op Pre-operative, post-op Post-operative, CHL Conductive hearing loss, HL Hearing loss