Noise-induced hearing loss continues to be one of the most common occupational disorders, even in workplaces where workers are protected by hearing loss prevention programs (HLPPs), according to a blog post on the CDC website. Although standards and regulations vary by country, virtually all hearing loss prevention programs require several elements: the measurement of noise exposures; the implementation of noise controls to reduce noise levels; conducting hearing tests on exposed workers; training of exposed workers; the use of hearing protection by exposed workers; and certain recordkeeping activities. (See the NIOSH Occupational Noise Exposure Criteria Document and the Practical Guide for Preventing Occupational Hearing Loss for details about implementing a successful hearing loss prevention program.)
However, despite the widespread adoption of HLPPs, there are no agreed-upon standards about how to evaluate the effectiveness of such programs. Also, there are few evidence-based tools allowing workplaces to evaluate their own programs.
About the HLPP Effectiveness Study:
A team of researchers from the University of Washington, University of Michigan, and Yale University recently carried out a NIOSH-funded study of HLPP effectiveness, the CDC reported. The team studied HLPPs at 14 US facilities operated by a single multinational metals manufacturing company. Collectively, these facilities employed more than 15,000 workers.
The team evaluated the HLPP of each facility in a number of ways. They:
- Interviewed 2-4 members of the HLPP management team at each facility;
- Conducted focus groups with workers (767 workers total);
- Administered an anonymous survey to 15-25% of workers at each facility (2027 workers total);
- Conducted new noise dosimetry measurements (513 measurements);
- Conducted full walkthroughs of each facility;
- Used expert judgment to rate elements of each program;
- Comprehensively assessed program costs, including overall costs, as well as costs by element (e.g. hearing testing, training, etc); and
- Analyzed hearing test and noise measurement data available from company records for each facility for ?10 years preceding the site visit.
What the Study Found:
The team identified exposures to high noise among many workers in the HLPPs; between one-third to two-thirds of full-shift dosimetry measurements at each facility were over 85 dBA. They also calculated an average annual HLPP cost of about $294/worker. Most of the facilities had a strong management commitment to preventing hearing loss, and workers at most facilities showed a strong personal commitment to protecting their hearing on the job. However, workers and management at few sites showed a commitment to protecting hearing off the job.
The HLPP Assessment Toolbox:
Based on the results of this research, the team created two self-evaluation tools for use by HLPP managers. The first tool is a checklist designed to evaluate facility compliance with mandatory HLPP requirements, as well as their adoption of best practice methods for preventing hearing loss. The second tool is a calculator that allows facilities to estimate the cost of their HLPP, both overall and by program element. Both tools are available on the NIOSH hearing loss prevention website.
Collectively, these evidence-based tools should provide HLPP managers the ability to evaluate and improve their programs in order to better protect workers from noise-induced hearing loss.
About the authors
Rick Neitzel, PhD, CIH, FAIHA is an Associate Professor and Associate Chair at the Department of Environmental Health Sciences at the University of Michigan.
Peter Rabinowitz, MD, MPH is an Associate Professor of Environmental and Occupational Health Sciences at the University of Washington.
Linda Cantley, MS is a Lecturer in Occupational Medicine at the Department of Occupational and Environmental Health at Yale University.
Chuck Kardous, MS, PE is a Senior Research Engineer in the NIOSH Division of Applied Research and Technology.
Source: CDC website