Causal pathology

Effective

Percentage (%)

Simple CMO with open tympanum

120

52.17

atelectatic otitis

35

15.21

cholesteatomatous CMO

26

11.30

Tympanosclerosis

11

4.78

Presbycusis

10

4.34

Otosclerosis

9

3.91

Chronic sound trauma

8

3.47

Acute sound trauma

6

2.60

External auditory meatus stenosis

3

1.30

rock fracture

2

0.86

Total

230

100