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Abstract
Regression analysis is a valuable statistical technique for following the evolution of hearing-loss over the course of time in acoustically traumatized subjects. On the basis of 5786 audiograms of 673 Swiss military pilots, it was found that aging is the most significant factor influencing the threshold shift of the test group. In accordance with the relative acoustical characteristics of the flight noise patterns, propeller craft seem to cause more damage to hearing than do jets. By considering the standard deviation from the regression curves, single flyers may be selected out in order to get more information about their individual sensitivities to noise damage.