preliminary otoscopy revealed tympanic membrane appearances consistent with middle ear effusion in a correspondingly low proportion of ears ( 7.6 per cent ) , whilst acoustic reflex screening at 105 db for three frequencies ( 0.5 , 1 and 2 khz ) showed absent reflexes at one or more frequencies in 8.1 per cent of the ears .
C0029883
middle ear effusion
C0013443
ears