Epidemiologic longitudinal study of a population of workers of the state railroads exposed to noise

: Loss of hearing due to chronic noise exposition is a well-known pathology and many nations have regulations for the protection of workers with periodical audiometry and ONT check-ups. For the last 15 years, the authors have followed state railway workers of the Milan area who were professionally exposed to noise. All were periodically examined by ONT specialists and submitted to audiometry. The findings underscore the importance of these periodical examinations and their efficacy for the prevention of hearing loss due to noise.