Analysis of hearing test results of 438 metal smelting workers

Abstract

Objective To investigate the auditory performance of noise-exposed workers in a metal smelting factory, and to analyze the relationship between different noise-age, hearing protection and noise damage, and to provide the basis for the prevention and control of noise. Methods According to GBZ188-2014 Occupational Health Surveillance Technical Specification, the pure tone audiometry test results of 438 workers in a special metal smelter in this city were analyzed statistically. Results The detection rate of hearing impairment was 25.6%.The incidence of hearing impairment in different occupational groups was statistically significant( 10 years 40.0%)(χ2=15.10, P<0.01). The incidence of hearing loss was compared between the hearing protection with wearing earplugs group(the earplug group) and without wearing earplugs group(the control group), the difference was statistically significant(20.0% in the earplug group and 31.2% in the control group, χ2= 20.15, P<0.01), and the noise detection rate was significantly higher in the earplug group than in the control group(4% in the earplug group and 12% in the control group, χ2=9.14, P<0.01). Conclusion Noise in the special metal smelting factory is more than that of the workers, so it is necessary to perfect the hearing protection measures as soon as possible. Key words: Noise, Occupational; Hearing Impaired Persons; Hearing Tests; Ear Protective Devices