The Time of Hearing Loss Onset among Workers in the Copper by-Industry and its Effective Factors
-
FATEMEH KHALDARI
,
NARGES KHANJANI
,
ABBAS BAHRAMPOUR
,
MOHAMMAD REZA GHOTBI RAVANDI
,
AliASGHAR ARABI MIANROODI
Abstract
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.
Keshtkar AA, Kabiri MJ, Asghari S, Nedjat S, Etemadi A, Heshmati R, Kanani Y, Holakouie Naeini K. A Study on noise- induced hearing loss in Agriculture and industry factory - Iran. Iran J Epidemiol 2005; 1(1): 59-64.
Nelson DI, Nelson RY, Concha Barrientos M, Fingerhut M. The global burden of occupational noise‐induced hearing loss. Am J Ind Med 2005; 48(6): 446-58.
Mohammadi S, Mazhari M, Mehrparvar A, Atarchi M. The effect of smoking on auditory system impairment in workers exposed to noise. Sci J Forensic Med 2009; 15(1): 43-8
Banan R, Jalali MM, Heidarzadeh A, Mehrdad SM, Ruhi Sefid Mazgi R, Bakhshi F. Effect of dyslipidemia on noise induced hearing loss. Razi J Med Sci 2012; 18(92):42-8.
Leensen MC, Dreschler WA. Longitudinal changes in hearing threshold levels of noise-exposed construction workers. Int Arch Occup Environ Health 2015; 1-16.
Mirmohamadi J, Baba Haji Mibodi F, Norani F. Hearing threshold level in workers of Meybod Tile factory. J Shaheed Sadoughi Univ Med Sci 2008; 16(1): 8-13.
Ferrite S, Santana V. Joint effects of smoking, noise exposure and age on hearing loss. Occup Med 2005; 55(1): 48-53.
Golmohammadi R, Amjad Sardorodi H, Dormohammadi A, Moosavi S. Study of occupational noise - induced hearing loss in a tractor manufacturing plant. Occup Med Quarterly J 2013; 4(3): 28-33.
Cantley LF, Galusha D, Cullen MR, Dixon-Ernst C, Rabinowitz PM, Neitzel RL. Association between ambient noise exposure, hearing acuity, and risk of acute occupational injury. Scand J Work Environ Health 2014; 41(1): 75.
Daneshi A. Modern Clinical Audiology. 1st ed, Danesh Faryar., Tehran, 2006.
Benjamin O. Fundamental Principles of Occupational Health and Safety. 3rd ed, ILO., Geneva, 2001.
Ballenger JJ. Disease of the noise, throat ear, head and neck. 1sted, Lea and Febiger; Philadelphia 1991., pp 1057-67
Golmohammadi R. Noise and vibration engineering. 3rd ed, Daneshjoo., Hamedan, 2007.
Toppila E, Pyykko I, Starck, J, Kaksonen R, Ishizaki H. Individual risk factors in the development of noise-induced hearing loss. Noise Health 2000; 2:9.
Agarwal SMA, Jagade M, Kasbekar V, Nagle SK. Effects of Hypertension on Hearing. Indian J Otolaryngol Head Neck Surg 2013; 65(Suppl 3): 614-8.
Jafarinadoushan R, Ebrahimzadeh M, Halvani G, Foroghinasab F. Evaluation of the Hearing State of Workers of a Uranium Mine in Central Region of Iran. Occup Med Quarterly J 2012; 3(3): 32-8.
Meyer J, Chen Y, Mcdonald J, Cherry N. Surveillance for work‐related hearing loss in the UK: OSSA and OPRA 1997–2000. Occ Med (London) 2002; 52(2): 75-9.
Lukzadeh Z, Foroghinasab F, Saranjam B, Shujaadini A, Soltanigerdframrzy R. Evaluation of relationship between noise-induced hearing loss with age and work duration in tile industry. Occup Med Quarterly J 2011; 3(2): 24-30.
Schink T, Kreutz G, Busch V, Pigeot I, Ahrens W. Incidence and relative risk of hearing disorders in professional musicians. Occup Environ Med 2014; Apr 30: oemed-2014
Farhadian M, Aliabadi M, Shahidi R. Risk assessment of influence factors on occupational hearing loss in noise – exposed workers in typical metal industry. Iran J Environ Health Sci Eng 2014; 1(3): 37-44.
Curhan SG, Eavey R, Shargorodsky J, Curhan GC. Prospective study of alcohol use and hearing loss in men. Ear Hear 2011; 32(1): 46.
Dawes P, Cruickshanks KJ, Moore DR, Edmondson-Jones M, McCormack A, Fortnum H. Cigarette Smoking, Passive Smoking, Alcohol Consumption, and Hearing Loss. J Assoc Res Otolaryngol 2014; 15(4): 663-74.
Shargorodsky J, Curhan SG, Henderson E, Eavey R, Curhan GC. Heavy metals exposure and hearing loss in US adolescents. Arch Otolaryngol Head Neck Surg 2011; 137(12): 1183-9.
| Files | ||
| Issue | Vol 8 No 3 (2016) | |
| Section | Original Article(s) | |
| Published | 2017-02-07 | |
| Keywords | ||
| Occupational hearing loss Survival analysis Cox regression Longitudinal study | ||
| Rights and permissions | |
|
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
