the arithmetic mean of differences of the auditory threshold and the threshold of middle ear reflexes in 214 ears examined at a frequency of 1000 hz is 45.5 db ( s = 16.3 db , min . 0 db , max . 80 db ) , in 208 ears at a frequency of 2000 hz 30.4 db ( s = 13.5 db , min . 0 db , max . 75 db ) , in 196 ears at frequency 3000 hz 23.2 db ( s = 12.6 db , min . 0 db , max . 85 db ) .
C0013455
middle ear
C0013443
ears