American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia. Fairfax, VA: American Industrial Hygiene Association, 1998 May; :39
Link
NIOSHTIC No.
20043785
Abstract
A cohort study of 3010 miners employed at least 1 year during 1960 to 1965 in four Chinese tin mines was conducted to investigate the risk of silicosis and cumulative exposure to silica-containing dust. Historical Chinese total dust data, which were collected differently from American total dust sampling method, were used to create a facility/job title/calendar year exposure matrix. Each worker's work history was abstracted from the complete employment records in mine files. Silicosis diagnoses were based on 1963 Chinese pneumoconiosis Roentgen diagnostic criteria, which classified silicosis as suspected or stages I-III. Suspected cases were not counted as silicosis cases in this study. There were 1015 (33.7%) miners who developed silicosis at an average age of 48.3 years, with an average duration of 21.3 years after first exposure. The risk of silicosis was found to be strongly related to cumulative total dust (CTD) exposure, and it can be well fitted by the Weibull distribution, with the risk of silicosis less than 1% when CTD exposure was under 10 mg/m3-years, and the risk increasing to 68.7% when CTD exposure was 150 mg/m3-years. This study predicts approximately a 30% cumulative risk of silicosis of a 40-year lifetime exposure to these tin mine dusts at the Chinese total dust exposure standard of 2 mg/m3. Total dust exposure data also were converted to respirable free silica exposure estimates (which introduces additional uncertainty into the exposure estimates) for comparison with findings from other epidemiologic studies of silicosis. This showed that the results were similar to most, but not all, findings from other large-scale exposure-response studies.
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.