you're saying tha... oh sorry...
YOU'RE SAYING THAT DESPITE YEARS OF MOTORBIKE RIDING AND WORK IN NOISY ENVIRONMENT YOUR HEARING IS BETTER THAN THE AVERAGE?

well, good for you. if i were you i'd go to the nearest university and offer myself as an interest case study.
now you understand that (given your case is still applicable considering requirements, levels and frequency of test, correctness of data, procedure and equipment) this could only been considered as a personal experience of no statistic value, right?
it's the ancient, rusty problem of the "old pal" everybody has that has crashed wearing nothing more than a t-shirt, had not even a scratch and now is claiming that atgatt is for morons...
so, if want to give us something useful simply repeat your test twice again, then build up a statistic graph of measurements.
then find out another bunch of guys with a similar story (at least 150-200. better 500. 1000 would be great.) test them three times and make similar graphs. then correct the data for age, gender, race, place, and anthropometric differences and come back here tellin us your findings.
it would be awesome.
while we wait we'll stick to others that have done all these stuff before you, and whose results are, as i said, worth of attention.
http://www.isvr.co.uk/at_work/m_cycle.htm
this is something newer:
http://www.cieh.org/jehr/hearing_los...rcyclists.html
and the cost327:
http://ec.europa.eu/transport/roadsa...nal_report.pdf
and here i report a screenshot (for the lazy ones...) of page 220-221 chapter 8:

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