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Percentage of hearing loss

David K. Brown dbrown at haircell.ear.ucalgary.ca
Tue Aug 8 00:12:07 EST 1995

In article <9508071251.AA03748 at linknet.net>, djcoffin at LINKNET.NET (David &
Gwen Coffin) wrote:

> I would like opinions regarding percentage of hearing loss.  Many of my 
> patients have been told by other health care providers (usually their ENT) 
> that they have XX% of hearing loss.  This determination appears to be based 
> on dB, not a formula (i.e., 50dB loss = 50% loss.) 

This is usually a calculation based on the AAOO method.  It is a weighted
average formula that was developed in about the 50's.  If you are
interested in the formula it can be found in Newby HA (1979) Audiology.
pp.157-159.  I my setting I hear it occasionally, that's when I spend
extra time explaining the audiogram and what it means to their
communication ability.  They then have a better understanding about its
meaning and not just some meaningless number.  So far it has worked.

David Brown
Hearing Research Lab
University of Calgary
Calgary, Alberta CANADA

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