]>
IRCT2013121515783N1 IRCT 2013-12-30 Post Graduate Research Grant University of Malaya The effectiveness of exposure to different sound levels in preserving hearing The effectiveness of applying different permissible exposure limits in preserving hearing threshold level among automobile industry workers: An intervention study 2012-02-01 anticipated 104 Complete https://irct.ir/trial/14945 interventional Randomization: Not randomized, Blinding: Single blinded, Placebo: Used, Assignment: Parallel, Purpose: Prevention, Other design features: The statistician was also blinded except the researchers. N/A Prevention of Noise-induced hearing loss. Intervention 1: Intervention (as control arm)- On Factory 1, Hearing protection devices were used to reduce noise exposure level between 85 and 90 dBA, based on noise reduction rate (currently adopted by the factory). Intervention 2: Second arm (Intervention)- Hearing protection devices were used to reduce noise exposure level between 80 and 85 dBA.
public Associate Prof. Dr. Tin Tin Su
Department of Social and Preventive Medicine, Faculty of Medicine Building, University of Malaya, 50603 Kuala Lumpur
Kuala Lumpur Malaysia 0060379674756 tstin@ummc.edu.my University of Malaya scientific Dr. Anselm Su Ting
Department of Community Medicine and Public Health, Faculty of Medicine and Health Sciences, University Malaysia Sarawak,Kuching, Sarawak, Malaysia
Kuching Malaysia 006082416550 anselmsuting@yahoo.com; anselmst@ummc.edu.my University Malaysia Sarawak, Malaysia Malaysia Inclusion criterion is subjects exposed to noise levels above action level (85 dBA in one factory and 80 dBA in another factory). Exclusion criteria are refused to participate, contract workers, who have diseases of ear, impacted wax, perforated tympanic membrane, physical trauma to ear, lorry drivers, who had undergone ear surgery and those have congenital hearing loss. no limit no limit Both H83.3 Noise-induced hearing loss Prevention Prevention Intervention (as control arm)- On Factory 1, Hearing protection devices were used to reduce noise exposure level between 85 and 90 dBA, based on noise reduction rate (currently adopted by the factory) Second arm (Intervention)- Hearing protection devices were used to reduce noise exposure level between 80 and 85 dBA Hearing threshold level. Timepoint: Six months. Method of measurement: Using manual audiometer. Measuring knowledge, attitude and practice on noise-induced hearing loss. Timepoint: Six months. Method of measurement: Through questionnaire. Post Graduate Research Grant University of Malaya Approved 2010-08-20 Medical Ethics Committee, University Malaya Medical Centre University of Malaya, Jalan Universiti Kuala Lumpur Kuala Lumpur Malaysia