Group | Type of Tympanoplasty | No. of ears | M/F | Age mean (years) (range) | Pre-operative ABG mean (dB) (range) | Post-operative ABG mean (dB) (range) | ABG Gain mean (dB) |
A | Type II―stapes columella | 65 | 41/24 | 42.6 (8 - 55) | 26.43 (5 - 40) | 23.70 (5 - 40) | +2.73 |
B | Tipo III―major columella | 42 | 20/22 | 44.8 (16 - 67) | 29.16 (15 - 60) | 30.01 (15 - 55) | −0.94 |
C | Type IV―round window | 13 | 8/5 | 54.7 (20 - 70) | 28.81 (20 - 60) | 25.20 (20 - 35) | +3.61 |