title: Study of the noise spectrum on high frequency thresholds in workers exposed to noise.
abstract: Noise level can be quantified and qualified based on sound characteristics such as intensity, type of spectrum, duration and distribution of the noise exposure during one's working hours.
  
  
  OBJECTIVE
  To assess noise spectrum and the audiometric configuration of workers.
  
  
  METHODS
  Contemporary cross-sectional cohort carried out in the Federal District - Brazil. We did an environmental analysis (spectral analysis) of the noise in companies from different industries, with audiological assessment of 347 workers.
  
  
  RESULTS
  The spectral analysis revealed peaks at different frequencies for each industry investigated (8 kHz-metallurgical, 4 kHz-stone Works and 2 kHz-wood works). We noticed that the frequencies of 14 kHz and 16 kHz had significant differences between the various industries, with a greater prevalence of the metallurgical.
  
  
  CONCLUSIONS
  The use of noise pressure measuring device, coupled to a frequency analyzer and high frequency audiometric assessment yielded an early detection of hearing damage, helping better organize preventive measures.
authors.affiliation: Universidade de Brasília. aureaottoni@yahoo.com.br
authors.forename: Aurea Oliveira Canha
authors.initials: AO
authors.lastname: Ottoni
authors.forename: Anadergh
authors.initials: A
authors.lastname: Barbosa-Branco
authors.forename: Marlene Escher
authors.initials: ME
authors.lastname: Boger
authors.forename: Sérgio Luiz
authors.initials: SL
authors.lastname: Garavelli
mesh_terms: D001299:Audiometry; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D006317:Hearing Loss, Noise-Induced / Q000175:diagnosis*; D006801:Humans; D008297:Male; D009623:Noise, Occupational / Q000009:adverse effects* / Q000706:statistics & numerical data; D009790:Occupations / Q000145:classification* / Q000706:statistics & numerical data