The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors

  • FATEMEH KHALDARI MSc Student, Department of Biostatistics and Epidemiology, Faculty of Health, Kerman University of Medical Sciences, Kerman, Iran;
  • NARGES KHANJANI Associate Professor, Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran
  • ABBAS BAHRAMPOUR Professor, Department of Biostatistics and Epidemiology, Faculty of Health, Kerman University of Medical Sciences, Kerman, Iran
  • MOHAMMAD REZA GHOTBI RAVANDI Assistant Professor, Department of Occupational Health, Faculty of Health, Kerman University of Medical Sciences, Kerman, Iran
  • Ali ALI ASGHAR ARABI MIANROODI Assistant Professor, Department of Ear, Nose and Throat, Faculty of Medicine, Kerman University of Medical Sciences, Kerman, Iran
Keywords: Occupational hearing loss, Survival analysis, Cox regression, Longitudinal study


 Extended exposure to noise can cause permanent hearing damage. This study aimed to determine the incidence time of hearing loss and its effective factors in workers exposed to noise. This retrospective cohort study, was conducted on a total of 273 workers in various sectors of Kerman Copper by-industries Co. Their hearing status and the incidence of hearing loss (hearing threshold higher than 25 dB) were measured at regular intervals through audiographs. Survival analysis was done using the Kaplan-Meier method and Cox Regression analysis through STATA 12. The time range (from the onset of the risk to the incidence of hearing loss) was between 8 to 14 years. Systolic blood pressure alone and in interaction with years of employment was significantly related to the incidence of hearing loss at all frequencies. Initial hearing threshold and age at employment also had a significant impact on the onset time of hearing loss. The interaction between age at employment×initial hearing threshold; and years of employment×age at employment; in both low and high frequencies had a significant impact on the incidence time of hearing loss.  Despite the availability of protective equipment in this industry, hearing loss occurred in at least half of the workers after about 10 years. High systolic blood pressure, age at employment, and initial hearing thresholds probably play a role in the incidence time of hearing loss.


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How to Cite
KHALDARI F, KHANJANI N, BAHRAMPOUR A, GHOTBI RAVANDI MR, ARABI MIANROODI AAA. The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors. Int J Occup Hyg. 8(3):172-178.
Original Article(s)