average(?) of spontaneous otoacoustic emissions

["Bruno L. Giordano" <brungio@xxxxxxxxx>]

Hello,

I would like to take a look at the spectrum of spontaneous otoacoustic 
emissions averaged across a possibly large number of normal-hearing 
individuals.

Can someone please suggest a reference? Does an average spectrum make 
sense when considering the amount of interindividual differences?

Thank you,

	Bruno