Mean hearing level after tympanic membrane perforation (n=522)
Mean hearing level after healing (n=522)
p value
ac (air conduction)
30.5 ± 11. 0
15.4 ± 10.2
<0.001
bc (bone conduction)
9.2 ± 5.4
7.8 ± 5.0
>0.05
ab (air-bone)gap
23.6 ± 10.8
8.2 ± 7.5
<0.001
Table 5
: Comparison of mean hearing level and their significance.
