Association of Occupational Noise Exposure and Extended High-Frequency Hearing Loss in Young Workers With Normal Hearing.
Panqi Xue, Wulan Zhao, Xiangjing Gao and 6 others
PMID 39726114WHAT IT FOUND
Young workers with normal hearing on standard tests had worse hearing at very high frequencies when they were exposed to occupational noise.
The difference was largest at the highest frequencies tested. Standard tests may miss early noise damage.
Key findings
01Workers exposed to occupational noise had higher mean hearing thresholds than non-exposed workers at all extended high frequencies tested, with group differences of 2.6 to 8.2 dB.
02Noise level was associated with higher hearing thresholds, and the association was stronger at extended high frequencies than at conventional frequencies.
03Use of hearing protection was not associated with lower extended high-frequency thresholds in the analysis.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study measured workers at one time point, so it cannot show that noise exposure caused the hearing-threshold differences. The participants were all from China, so the results may not apply to other workplaces or populations. Recreational noise, smoking, ototoxic chemicals, and systemic autoimmune rheumatic diseases were not measured, so they may have influenced the thresholds. Extended high-frequency thresholds were more variable between people than conventional thresholds, and reference values are still needed. Hearing-protection use was assessed by questionnaire and observation, and workers may have misreported use or worn protectors improperly. Equipment calibration was annual rather than daily.
Declared interests
This work was supported by Grant No. 1R01DC015990 from the National Institute on Deafness and Other Communication Disorders, USA, and by the Medical Health Technology Project of the Health Commission of Zhejiang. No other conflicts of interest are reported.
The easy way to misread this
Do not read the finding that hearing-protection use was not associated with lower extended high-frequency thresholds as proof that protectors do not work. The study measured people at one time point, protection use was assessed by report and observation, and workers may have misreported use or worn protectors improperly.