title: [Prevalence of hearing loss and correlated factors in a cement plant].
abstract: OBJECTIVE
  To assess the impact of occupational exposure to noise, as well as its relationship with other factors that can induce hearing loss.
  
  
  METHODS
  In January and February 1997, we conducted sonometry and dosimetry tests in a cement factory, as well as audiometric test in 85 cement workers, to identify sources of noise and evaluate the effect to noise exposure and other factors, of the prevalence of occupational hearing loss. Statistical analysis was conducted using measures of central tendency, bivariate analysis and polynominal regression models.
  
  
  RESULTS
  High noise levels were found in the crushing, crude milling, and cement milling sites. The highest individual dose corresponded to the packer job post. Fifty-five per cent of the study population presented some degree of hearing loss due to noise exposure. The cement processing area with the highest percentage of damaged workers was calcination.
  
  
  CONCLUSIONS
  Our results show that noise is a serious risk factor in particular sites of cement factories, and also that an elevated number of hearing loss cases are due to occupational noise exposure in this industry; Our findings underscore the need for designing and implementing hearing protection programs, to assure the health and safety of cement workers.
authors.affiliation: Centro de Investigación en Sistemas de Salud, Instituto Nacional de Salud Pública (INSP), México. sgaytan@insp3.insp.mx
authors.forename: S I
authors.initials: SI
authors.lastname: Hernández-Gaytán
authors.forename: C
authors.initials: C
authors.lastname: Santos-Burgoa
authors.forename: J P
authors.initials: JP
authors.lastname: Becker-Meyer
authors.forename: C
authors.initials: C
authors.lastname: Macías-Carrillo
authors.forename: M
authors.initials: M
authors.lastname: López-Cervantes
mesh_terms: D000293:Adolescent; D000328:Adult; D003252:Construction Materials; D003430:Cross-Sectional Studies; D003638:Deafness / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009622:Noise / Q000009:adverse effects*; D009784:Occupational Diseases / Q000453:epidemiology*; D015995:Prevalence