An ongoing NIOSH study to evaluate hearing loss risk for workers with long term exposure to high noise levels required reconstruction of employee noise exposure history. The following steps which were used for the process of noise exposure reconstruction will be presented. a) Sound level measurements, documented during plant-wide surveys in 1970-71, and 1985-86, were linked to plant departments based on measurement locations. b) Based on company documents indicating when plant process or equipment changes occurred, two time periods having different exposure conditions were identified: 1970-84, and 1985-90. c) Average sound levels for each department were calculated for the two time periods. d) Work histories for each job code, which included department/job task locations and task times, were developed based on employee interviews and current job code information. e) Using work history information and calculated department sound levels a time-dependent job exposure matrix was developed for each department/job code combination.
Links with this icon indicate that you are leaving the CDC website.
The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website.
Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
You will be subject to the destination website's privacy policy when you follow the link.
CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website.
For more information on CDC's web notification policies, see Website Disclaimers.
CDC.gov Privacy Settings
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.
Thank you for taking the time to confirm your preferences. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page.