title: Noise-induced hearing loss in bus and truck drivers in Mazandaran province, 2011.
abstract: OBJECTIVE
  Noise-induced hearing loss (NIHL) is among the most prevalent and preventable work-related disorders. This study was conducted to evaluate the prevalence and severity of NIHL in bus and truck drivers of Mazandaran province in north Iran.
  
  
  METHODS
  In a cross-sectional descriptive study, 2283 drivers were examined clinically and para-clinically, including measuring their fasting blood sugar, triglyceride and cholesterol levels. All participants were evaluated for the air and bone thresholds of both ears. Twenty-three individuals were excluded from the study because of conductive hearing loss. Data from 2260 drivers were analyzed using SPSS version 18.
  
  
  RESULTS
  Of the drivers, 37.5% had hearing loss in the right ear and 41.8% of the drivers had hearing loss in the left ear in one or more frequencies of sound. Hearing loss was significantly more frequent in the left ear and in 6000 Hz followed by 4000 Hz.
  
  
  CONCLUSIONS
  Our study showed that the prevalence and severity of NIHL is high in drivers of Mazandaran province. There was a correlation between hearing loss and age and driving work history. We recommend considering hearing conservation programs more seriously.
authors.affiliation: a Mazandaran University of Medical Sciences , Iran.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Alizadeh
authors.affiliation: a Mazandaran University of Medical Sciences , Iran.
authors.forename: Siavash
authors.initials: S
authors.lastname: Etemadinezhad
authors.affiliation: a Mazandaran University of Medical Sciences , Iran.
authors.forename: Jamshid Yazdani
authors.initials: JY
authors.lastname: Charati
authors.affiliation: a Mazandaran University of Medical Sciences , Iran.
authors.forename: Mahmood
authors.initials: M
authors.lastname: Mohamadiyan
mesh_terms: D000328:Adult; D000367:Age Factors; D001299:Audiometry; D001334:Automobile Driving; D001786:Blood Glucose; D001794:Blood Pressure; D003430:Cross-Sectional Studies; D003920:Diabetes Mellitus / Q000453:epidemiology; D006317:Hearing Loss, Noise-Induced / Q000453:epidemiology*; D006801:Humans; D006973:Hypertension / Q000453:epidemiology; D007492:Iran / Q000453:epidemiology; D008055:Lipids / Q000097:blood; D008297:Male; D008875:Middle Aged; D009623:Noise, Occupational / Q000009:adverse effects*; D009784:Occupational Diseases / Q000453:epidemiology*; D016273:Occupational Exposure / Q000009:adverse effects*; D015995:Prevalence; D012307:Risk Factors; D012720:Severity of Illness Index
chemical_list: D001786:Blood Glucose; D008055:Lipids
keywords: Iran; driver; hearing loss