Group (No.)

Type of Tympanoplasty

No. of ears

ABG 0 - 20 dB

No. of ears

ABG 20 - 40 dB

No. of ears

ABG > 40 dB

Pre-op.

Post-op.

Pre-op.

Post-op.

Pre-op.

Post-op.

A

(65)

Type II―stapes columella

25

(38.4%)

33

(50.7%)

35

(53.8%)

28

(43.07%)

5

(7.6%)

4

(6.15%)

B

(42)

Type III―major columella

7

(16.6%)

18

(42.8%)

27

(64.28%)

15

(35.7%)

8

(19.0%)

9

(21.5%)

C

(13)

Type IV―round window

0

(0.0%)

5

(38.5%)

4

(30.8%)

6

(46.2%)

9

(69.2%)

2

(15.3%)