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1 | ![chart thumbnail - click on image for larger view.](https://webarchive.library.unt.edu/eot2008/20081104145659im_/http://www.cdc.gov/niosh/docs/2004-146/niosh/images/chartbook/thumb/fig2-181th.gif) | Figure 2-181 Prevalence of CWXSP-examined miners with CWP category 1/0 or greater by tenure in underground coal mining, 1970-1999. During 1970-1999, the prevalence of CWP category 1/0 or greater decreased among all tenure groups toward the prevalence of the baseline tenure group (0-9 years in underground coal mining). (Source: NIOSH [2002g].)
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2 | ![chart thumbnail - click on image for larger view.](https://webarchive.library.unt.edu/eot2008/20081104145659im_/http://www.cdc.gov/niosh/docs/2004-146/niosh/images/chartbook/thumb/fig2-182th.gif) | Figure 2-182 Prevalence of CWXSP-examined miners with CWP category 2/1 or greater by tenure in underground coal mining, 1970-1999. During 1970-1999, the prevalence of CWP category 2/1 or greater decreased among all tenure groups toward the prevalence of the baseline tenure group (0-9 years in underground coal mining). (Source: NIOSH [2002g].)
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