National Surveillance for Occupational Hearing Loss SangWoo Tak, ScD, MPH SangWoo Tak, ScD, MPH Geoffrey M. Calvert, MD, MPH Geoffrey M. Calvert, MD, MPH Division of Surveillance, Hazard Division of Surveillance, Hazard Evaluation, and Field Studies Evaluation, and Field Studies NIOSH NIOSH CDC/DHHS CDC/DHHS
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National Surveillance for Occupational Hearing Loss
National Surveillance for Occupational Hearing Loss. SangWoo Tak, ScD, MPH Geoffrey M. Calvert, MD, MPH Division of Surveillance, Hazard Evaluation, and Field Studies. NIOSH CDC/DHHS. Chronology. - PowerPoint PPT Presentation
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National Surveillance for Occupational Hearing Loss
SangWoo Tak, ScD, MPHSangWoo Tak, ScD, MPH
Geoffrey M. Calvert, MD, MPHGeoffrey M. Calvert, MD, MPH
Division of Surveillance, Hazard Division of Surveillance, Hazard Evaluation, and Field StudiesEvaluation, and Field Studies
NIOSHNIOSHCDC/DHHSCDC/DHHS
Chronology
2005 – National Academy of Science 2005 – National Academy of Science (Institute of Medicine) recommends national (Institute of Medicine) recommends national surveillance for OHL and noise exposuresurveillance for OHL and noise exposure
To conduct surveillance research to track To conduct surveillance research to track
occupational hearing lossoccupational hearing loss
To develop the first ever national surveillance To develop the first ever national surveillance
system on OHLsystem on OHL
Where are the data?
NHCA – audiometric service providers NHCA – audiometric service providers across the USacross the US
In December 2007, a recruiting letter sent In December 2007, a recruiting letter sent to all audiometric service provider to all audiometric service provider membersmembers
Six providers gave a positive responseSix providers gave a positive response
Received letters of support from five of Received letters of support from five of these audiometric service providers these audiometric service providers
Hearing loss prevention programs
Workers
Audiometric Service
Providers
Employers
NIOSH OHL
Surveillance
AnalysisIncidence &Prevalence
InterpretationBy industry
CollectionNational Data
Repository
DisseminationPreventiveintervention
Audiograms,Noise survey data
Stakeholders Industry
Labor unions State health departments
Practitioners Scientific community
Specific aim 1
Collect audiometric data from audiometric Collect audiometric data from audiometric testing service providers to develop an testing service providers to develop an audiometric data repository audiometric data repository
Tasks Recruit 15 audiometric service providers Recruit 15 audiometric service providers
across the countryacross the country
11stst year: 3 year: 3
22ndnd year: 5 year: 5
33rdrd year: 7 year: 7
Retrieve historical data for those who were Retrieve historical data for those who were tested at lease once from 01/2003 to 12/2008tested at lease once from 01/2003 to 12/2008
Identify a audiometric data repository systemIdentify a audiometric data repository system
Data elementsDemographic characteristics of the workerDemographic characteristics of the worker
1)1) Unique identifier (will be assigned by data provider)Unique identifier (will be assigned by data provider)
2)2) GenderGender
3)3) Date of birthDate of birth
Workplace variablesWorkplace variables
1)1) Workplace stateWorkplace state
2)2) Unique identifierUnique identifier
3)3) Industry code and literals (NAICS 2002)Industry code and literals (NAICS 2002)
2)2) Threshold for each pure tone frequency (500, 1K, 2K, 3K, 4K, Threshold for each pure tone frequency (500, 1K, 2K, 3K, 4K, 6K, and 8K). 6K, and 8K).
Specific aim 2
Estimate the rate of occupational hearing loss Estimate the rate of occupational hearing loss and changes in hearing per year and changes in hearing per year by industry by industry using NAICS codes*using NAICS codes*
North American Industry Classification SystemNorth American Industry Classification System
Tasks
Data management Data management
CleaningCleaning
Quality controlQuality control
Protocol for data managementProtocol for data management
Descriptive data analyses by industryDescriptive data analyses by industry
Report disseminationReport dissemination
Specific aim 3
Identify specific industries associated with a Identify specific industries associated with a high risk of occupational hearing loss in the high risk of occupational hearing loss in the construction and manufacturing industry construction and manufacturing industry sectorssectors
Definitions
OHL -- average hearing threshold of 25 dB or greater at OHL -- average hearing threshold of 25 dB or greater at frequencies of 0.5k, 2k, 3k, and 4k Hz in either earfrequencies of 0.5k, 2k, 3k, and 4k Hz in either ear
Standard threshold shift (STS) -- average increase from Standard threshold shift (STS) -- average increase from baseline of 10 dB or more (pure tone test in the baseline of 10 dB or more (pure tone test in the frequencies of 2k, 3k, and 4k Hz in either ear)frequencies of 2k, 3k, and 4k Hz in either ear)
NIOSH defines STS as shift from baseline of 15 dB or NIOSH defines STS as shift from baseline of 15 dB or more at any test frequency in either ear more at any test frequency in either ear