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Effectiveness of Workplace Noise-risk Classification with Hearing Protection in Preventing Occupational Hearing Loss
1Emergency Office, Hunan Prevention and Treatment Institute for Occupational Diseases (Affiliated Prevention and Treatment Institute for Occupational Diseases of University of South China), Changsha, Hunan, PR China.
Noise & Health
|July 14, 2026
Summary
Combining workplace noise-risk classification with a hearing protection program significantly reduced occupational noise-induced hearing loss (ONIHL) and improved compliance in manufacturing workers.
Area of Science:
- Occupational Health
- Audiology
- Industrial Hygiene
Background:
- Occupational noise-induced hearing loss (ONIHL) remains a significant concern in manufacturing.
- Traditional hearing protection methods may not be sufficient to prevent hearing damage.
Purpose of the Study:
- To evaluate the effectiveness of an integrated strategy combining workplace noise-risk classification and a hearing protection program.
- To prevent occupational noise-induced hearing loss (ONIHL) in noise-exposed workers.
Main Methods:
- A retrospective cohort study of 400 male workers in an automotive manufacturing company.
- Participants were assigned to a control group (traditional measures) or an observation group (risk classification plus standardized hearing protection).
- Outcomes included PPE use, noise exposure, and hearing loss rates assessed at follow-up.
Main Results:
- The observation group demonstrated significantly higher PPE compliance (87.50% vs. 63.00%) and lower noise exposure (86.26 vs. 88.72 dB(A)).
- Significantly lower rates of speech-frequency hearing loss (20.00% vs. 52.50%), high-frequency hearing loss (35.00% vs. 65.00%), and ONIHL (1.00% vs. 5.50%) were observed in the observation group.
- Subgroup analyses showed significant protective effects in stamping and machining operations.
Conclusions:
- The integrated strategy improved protection compliance, reduced noise exposure, and lowered hearing loss rates.
- Causal inferences should be made cautiously due to the non-randomized study design.
- Prospective studies are recommended to confirm the causality of the observed benefits.
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