I wonder how many people who work in the CX business know this statistic? I wonder how many companies have changed how they operate because of this fact - I know the answer to that one (very, very few).
The New York Times has a good article about the issues of hearing loss. Sorry it is behind a Paywall.
As somebody with hearing problems I know the irritation it causes and how easy it would be for customer facing staff to make life easier for those of us who spend too much of our life saying 'pardon', 'could you say that again'....... Dick Stroud