title: The effect of improved hearing protection regulations in the prevention of military noise-induced hearing loss.
abstract: CONCLUSIONS
  Hearing protection regulations have improved the hearing test results of soldiers in the Finnish Defense Forces.
  
  
  OBJECTIVE
  To investigate the effect of revised regulations regarding usage of hearing protectors of professional soldiers in the Finnish Defense Forces.
  
  
  METHODS
  The medical records of non-commissioned officers and officers examined at the Central Military Hospital ENT Department from 1984 to 1986 (Period I) and 2003 to 2005 (Period II) were reviewed. The study group comprised 252 persons. Changes in hearing between the two time periods, during which regulations were revised, were investigated.
  
  
  RESULTS
  Hearing test results improved both in non-commissioned officers and in officers between the two study periods, in accordance with tightened hearing protection regulations. Improvement was found, especially in the high frequencies; however, the results were milder than expected, particularly in officers.
authors.affiliation: Department of ENT, Helsinki University Central Hospital, Helsinki, Finland. roderik_mrena@yahoo.com
authors.forename: Roderik
authors.initials: R
authors.lastname: Mrena
authors.forename: Jukka
authors.initials: J
authors.lastname: Ylikoski
authors.forename: Heikki
authors.initials: H
authors.lastname: Kiukaanniemi
authors.forename: Antti A
authors.initials: AA
authors.lastname: Mäkitie
authors.forename: Seppo
authors.initials: S
authors.lastname: Savolainen
mesh_terms: D000328:Adult; D001299:Audiometry; D001309:Auditory Threshold; D015331:Cohort Studies; D004430:Ear Protective Devices; D005387:Finland / Q000453:epidemiology; D006317:Hearing Loss, Noise-Induced / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control*; D006801:Humans; D008875:Middle Aged; D008889:Military Personnel; D009784:Occupational Diseases / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control*; D016272:Occupational Health / Q000331:legislation & jurisprudence*; D012189:Retrospective Studies