The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors
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-indus...
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| Format: | Article |
| Language: | English |
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Tehran University of Medical Sciences
2017-02-01
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| Series: | International Journal of Occupational Hygiene |
| Subjects: | |
| Online Access: | https://ijoh.tums.ac.ir/index.php/ijoh/article/view/241 |
| _version_ | 1818789147041595392 |
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| author | FATEMEH KHALDARI NARGES KHANJANI ABBAS BAHRAMPOUR MOHAMMAD REZA GHOTBI RAVANDI Ali ALI ASGHAR ARABI MIANROODI |
| author_facet | FATEMEH KHALDARI NARGES KHANJANI ABBAS BAHRAMPOUR MOHAMMAD REZA GHOTBI RAVANDI Ali ALI ASGHAR ARABI MIANROODI |
| author_sort | FATEMEH KHALDARI |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-18T14:34:56Z |
| format | Article |
| id | doaj.art-834c5521036d4e849a9f93d21aee24e8 |
| institution | Directory Open Access Journal |
| issn | 2008-5109 2008-5435 |
| language | English |
| last_indexed | 2024-12-18T14:34:56Z |
| publishDate | 2017-02-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | International Journal of Occupational Hygiene |
| spelling | doaj.art-834c5521036d4e849a9f93d21aee24e82022-12-21T21:04:30ZengTehran University of Medical SciencesInternational Journal of Occupational Hygiene2008-51092008-54352017-02-0183The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective FactorsFATEMEH KHALDARI0NARGES KHANJANI1ABBAS BAHRAMPOUR2MOHAMMAD REZA GHOTBI RAVANDI3Ali ALI ASGHAR ARABI MIANROODI4MSc Student, Department of Biostatistics and Epidemiology, Faculty of Health, Kerman University of Medical Sciences, Kerman, Iran;Associate Professor, Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, IranProfessor, Department of Biostatistics and Epidemiology, Faculty of Health, Kerman University of Medical Sciences, Kerman, IranAssistant Professor, Department of Occupational Health, Faculty of Health, Kerman University of Medical Sciences, Kerman, IranAssistant Professor, Department of Ear, Nose and Throat, Faculty of Medicine, Kerman University of Medical Sciences, Kerman, IranExtended 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.https://ijoh.tums.ac.ir/index.php/ijoh/article/view/241Occupational hearing lossSurvival analysisCox regressionLongitudinal study |
| spellingShingle | FATEMEH KHALDARI NARGES KHANJANI ABBAS BAHRAMPOUR MOHAMMAD REZA GHOTBI RAVANDI Ali ALI ASGHAR ARABI MIANROODI The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors International Journal of Occupational Hygiene Occupational hearing loss Survival analysis Cox regression Longitudinal study |
| title | The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors |
| title_full | The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors |
| title_fullStr | The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors |
| title_full_unstemmed | The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors |
| title_short | The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors |
| title_sort | time of hearing loss onset among workers in the copper by industry and its effective factors |
| topic | Occupational hearing loss Survival analysis Cox regression Longitudinal study |
| url | https://ijoh.tums.ac.ir/index.php/ijoh/article/view/241 |
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