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  • Title: Hearing Loss in Persons Exposed and not Exposed to Occupational Noise.
    Author: Kovalova M, Mrazkova E, Sachova P, Vojkovska K, Tomaskova H, Janoutova J, Janout V.
    Journal: J Int Adv Otol; 2016 Apr; 12(1):49-54. PubMed ID: 27340983.
    Abstract:
    OBJECTIVE: This study aimed to compare hearing loss in individuals at risk and those not at risk for occupational noise and to compare working loss by gender. MATERIALS AND METHODS: The analysis used data from a current Czech Ministry of Health grant project called Epidemiological and Genetic Study of the Frequency of Hearing Loss (2011 to 2015; NT12246-5/2011). The analyzed sample comprised 4988 participants. Hearing was tested using pure-tone threshold audiometry, tympanometry, and measurement of the stapedius reflex. RESULTS: Females at risk and those not at risk for occupational noise who were younger than 44 years and older than 75 years were found to have no statistically significant differences at any pure-tone threshold audiometry frequency. In females aged 45 to 74 years, statistically significant differences were found. In males, hearing loss was observed as early as 18 years of age. When comparing males and females at no risk for occupational noise, there were no statistically significant differences at any of the frequencies in those younger than 29 years. In females aged 30 years or older, statistically significant differences were observed at various frequencies in all age groups. When comparing males and females at risk for occupational noise, statistically significant differences were more frequent than in employees not exposed to noise. CONCLUSION: Hearing loss in females does not significantly vary depending on occupational exposure. The opposite is true for males. However, the maximum differences in mean levels did not exceed 10 dB. It is therefore clear that noise is a preventable factor, and the use of personal protective equipment is warranted.
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