NIOSH Safety and Health Topic:Occupational Respiratory Disease Surveillance |
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County Summary ReportSTATISTICS FOR MINERS WORKING IN KANAWHA COUNTY, WEST VIRGINIASurvey SitesX-rays were taken from 09/12/2007 through 09/14/2007 in COAL SHOW, BLUEFIELD, WEST VIRIGINA. X-rays were taken from 04/06/2008 through 04/19/2008 in RANDOLPH, UPSHUR, WEBSTER, NICHOLAS, & FAYETTE COUNTIES, WEST VIRGINIA. X-rays were taken from 07/13/2008 through 07/19/2008 in KANAWAH COUNTY, WEST VIRGINIA. X-rays were taken from 07/19/2008 through 07/26/2008 in HARRISON & BARBOUR, COUNTIES, WEST VIRGINIA. X-rays were taken from 08/13/2008 through 08/14/2008 in MINE RESCUE CONTEST, MORGANTOWN, WEST VIRGINIA. Demographics Data for the Survey SiteFor the survey, there was an estimated employment of 587 in 2008. Of those 587 employed, there were 62 examined for a participation rate of 11%.
Demographics Data for the Five Years Prior to the SurveyFor the period of 2004 through 2008, there was an estimated employment of 856. Of those 856 employed, there were 72 examined for a participation rate of 8%. Prevalence of DiseaseOf the 62 miners examined:
Expected Prevalence of Disease for Workers with 15 or more Tenure YearsFor the counties included in this report, the average dust level is 1.01 mg/m3. Of the 62 miners examined, 36 had 15 or more tenure years:
Distribution of Radiographic FindingsFor the 62 miners examined, the distribution of the miners in the profusion of small opacities categories is:
For the 62 miners examined, the distribution of the miners in the large opacities stages is:
For the 62 miners examined, the distribution for symbol ax is:
Prevalence of Clinical FindingsFor the 62 miners examined, 62 responded to the clinical findings questionnaire.
Smoking StatusFor the 62 miners examined, 62 responded to the cigarette smoking history question on the clinical findings questionnaire.
Spirometry ResultsFor the 62 miners examined, 62 also had a spirometry test.
Methods used for the Demographics DataSURVEY PARTICIPATION RATE: count of the number of miners with a valid x-ray during the survey period (NUMBER OF MINERS EXAMINED) divided by the count of the names on the most recent mine rosters submitted to NIOSH by the mine operators (ESTIMATED CURRENT EMPLOYMENT). 5-YEAR PARTICIPATION RATE: count of the number miners with a valid x-ray during the 5-year period preceding the date of the end of the survey (5-YEAR MINERS EXAMINED) divided by the count of the names on the mine rosters that accompanied the mine plans that were submitted to NIOSH by the miner operators during the 5-year period preceding the date of the end of the survey (ESTIMATED 5-YEAR EMPLOYMENT). TENURE - MEAN: summation of the reported years in various underground mining occupations divided by count of participating miners with a completed work history (N). AGE - MEAN: summation of the calculated age at time of the x-ray divided by count of participating miners who provided their date of birth (N). TENURE AT THE FACE - MEAN: summation of the reported years of working at the face divided by count of participating miners who reported working at the face (N). METHODS USED FOR THE PREVALENCE OF DISEASE DATAPNEUMOCONIOSIS: number of x-rays with a final determination (consensus based upon NIOSH procedures) of the International Labour Office (ILO) small opacity profusion category 1/0 or higher or with the presence of large opacities, divided by the number of participating miners with a valid x-ray. PMF: number of x-rays with a final determination of ILO large opacity category "A", "B", or "C" divided by the number of participating miners with a valid x-ray. ADVANCED: number of x-rays with a final determination of ILO small opacity profusion category 2/1 or higher and presence of symbol "ax" (coalescence of small opacities) or ILO large opacity category of "A", "B", or "C" divided by the number of participating miners with a valid x-ray. Methods used for the Expected Prevalence DataPNEUMOCONIOSIS, PMF & ADVANCED: count and percent of expected cases of pneumoconiosis, PMF, and advanced disease for a given mean respirable dust level (concentration) and for the specific type of coal in the region, calculated according to Attfield MD, Morring K. Am Ind Hyg Assoc J 1992; 53:486-492. Methods used for the Distribution of Radiographic FindingsPROFUSION OF SMALL OPACITIES, LARGE OPACITIES & SYMBOLS: count and percent of the x-rays using the final determination of the ILO small opacity, the final determination of the ILO large opacity, and symbol "ax". Methods used for the Prevalence of the Clinical FindingsSELF-REPORTED: count and percent of self-reported symptoms and/or medical conditions based on the participating miners who completed the health questionnaire survey. Methods used for the Smoking Status DataNEVER SMOKER, FORMER SMOKER, & CURRENT SMOKER: count and percent of participating miners who completed the health questionnaire survey miners reporting each smoking history. Methods used for the Spirometry ResultsOBSTRUCTIVE, RESTRICTIVE, & MIXED: number and percent of miners who participated in the spirometry testing and whose results showed one of the following categories of respiratory impairment using forced expiratory volume in one second (FEV1) and forced vital capacity (FVC) ratio:
Page last updated: November 12, 2008
Page last reviewed: November 12, 2008 Content Source: National Institute for Occupational Safety and Health (NIOSH) Division of Respiratory Disease Studies |
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