the real-ear attenuation data for 81 different hearing protectors were analyzed with respect to the errors that would arise if , instead of averaging the 1/3-octave-band results at 3.15 and 4 khz and 6.3 and 8 khz , respectively , the octave-band attenuation at 4 and 8 khz was estimated from only the 1/3-octave-band data at those two frequencies .
C0013443
ear
C0018767
hearing