Effectiveness of Kurtosis-Adjusted Cumulative Noise Exposure in Assessing Occupational Hearing Loss Associated With Complex Noise.
Jiarui Xin, Zhihao Shi, Peiyi Qian and 6 others
PMID 36629325WHAT IT FOUND
In 1404 workers exposed to factory noise, adding impulse characteristics to cumulative exposure better matched hearing-loss risk.
Complex-noise workers had deeper hearing-test dips, and the adjusted score reduced the gap with Gaussian-noise workers from 8.1% to 0.4%.
Key findings
01Kurtosis of 50 to less than 100 was associated with an odds ratio of 1.5, and kurtosis of 100 or more with an odds ratio of 2.3.
02Adjusting cumulative noise exposure by kurtosis made the complex-noise and Gaussian-noise dose-response curves nearly overlap. The average difference in high-frequency noise-induced hearing loss percentage decreased from 8.1 to 0.4%.
03The kurtosis-adjusted cumulative exposure score predicted high-frequency noise-induced hearing loss with an area under the curve of 0.669, compared with 0.651 for the unadjusted score.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study was cross-sectional, so it cannot show that complex noise or the kurtosis-adjusted score caused hearing loss. The effectiveness of CNE-K among female workers was not observed because only 455 women were included and subgroup sample sizes were insufficient. The reported complex-noise group size differs between the methods text, which says 1145 workers, and Table 1, which lists 1156 workers. The findings are from Chinese manufacturing workers selected with strict hearing and health exclusions, so they may not apply to all noisy workplaces. The paper does not report a pre-registered primary outcome, so the main comparison is inferred from the title and conclusions.
Declared interests
This research was funded by the National Key R&D Program of China and the Fundamental Research Funds for the Central University. The authors report no conflicts of interest.
The easy way to misread this
Do not read the improved prediction as proof that measuring kurtosis will prevent occupational hearing loss. The study was cross-sectional and measured existing hearing loss, not future cases or outcomes after an intervention.