the mean post-operative air-bone gap was significantly better in ears with mild histopathological changes than in ears with severe histopathological changes in the middle ear ( 17.0 db./33.1 db . ; p less than 0.001 ) or mastoid ( 29.0 db./34.2 db . ; p less than 0.01 ) at operation .
C0013443
ears
C0013455
middle ear