Anuar, Ahmad Mirza Azhad (2024) The prevalence of hearing impairment due to noise exposure among refinery edible oil workers in Pasir Gudang, Johor. [Project Paper] (Submitted)
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Abstract
Introduction: Malaysia became a major contributor for the world's largest export (34.3%) and production (25.8%) of palm oil. Working in a country with mass production palm oil export may cause the workers to be more susceptible as being exposed to high noise intensity at the workplace continuously. The exposure may result in developing severe hearing impairment, which is irreversible, cumulative, and permanent. Objective: To determine the prevalence of hearing impairment due to occupational noise exposure in a refinery palm oil factory at Pasir Gudang, Johor. The specific objectives include to determine the sociodemographic factors of the respondents, to measure the noise level at different work units of the factory, to calculate the personal noise exposure, to determine the prevalence of hearing impairment, to identify the occupational risk factors and to associate between hearing impairment with sociodemographic factors, noise exposure level and occupational risk factors among respondents. Method: A cross-sectional study was conducted from August to September 2023 at a refinery palm oil factory in Pasir Gudang, Johor. A total of 70 noise-exposed workers that meet the inclusion and exclusion criteria of this study have completed a set of questionnaires which concentrated on sociodemographic, occupational and health information which may have detrimental effects on hearing problems. The area monitoring was measured using a sound level meter and personal noise exposure was measured by using noise dosimeter. This study uses the secondary data which is the latest audiometric test result (2023) of the respondent that was obtained from annual health screening of the employees. This data can determine whether the employee had hearing impairment due to their employment at a Refinery oil factory. All data obtained was analyzed using SPSS. Result: Descriptive analysis shows the prevalence of hearing impairment was 8.6%. The result of Fisher exact test with the value p<0.05 demonstrate the risk factors such as age (p=0.020), service duration (p=0.038) and PHP usage (p=0.038) had significant association with hearing impairment. Most of the data on measured noise exposure level was less than 85 dBA (mean Lex8h = 81.2, median = 81.5, IQR = 5.1). Besides, the hearing impairments were fairly associated with noise exposure level with ETA correlation coefficient, η = 0.445. Conclusion: The findings show there are four risk factors that can contribute to hearing impairment occurrence which are age, service durations, noise exposure and PHP usage. This outcome contributes towards better understanding of risk factors of hearing impairment among refinery palm oil workers. Keywords: Hearing impairment, occupational noise exposure, palm oil refinery, occupational risk factors.
| Item Type: | Project Paper |
|---|---|
| Subjects: | R Medicine > RA Public aspects of medicine |
| Faculty: | Faculty of Medicine and Health Science |
| Depositing User: | Ms Norafizah Radzuan |
| Date Deposited: | 29 Apr 2025 06:32 |
| Last Modified: | 16 Oct 2025 01:42 |
| URI: | http://psaspb.upm.edu.my/id/eprint/2385 |
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