NIOSH Safety and Health Topic:Occupational Respiratory Disease Surveillance |
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State Summary ReportSTATISTICS FOR MINERS WORKING IN COLORADOSurvey SitesX-rays were taken from 09/21/2005 through 09/22/2005 in NATIONAL MINE RESCUE CONFERENCE, LOUISVILLE, KENTUCKY. X-rays were taken from 08/28/2007 through 08/31/2007 in MINE RESCUE CONTEST, NASHVILLE, TENNESSEE. X-rays were taken from 10/23/2007 through 11/02/2007 in DELTA, GARFIELD, GUNNISON, LA PLATA, RIO BLANCO, & ROUTT COUNTIES, COLORADO. Demographics Data for the Survey SiteFor the survey, there was an estimated employment of 1,554 in 2007. Of those 1,554 employed, there were 357 examined for a participation rate of 23%.
Demographics Data for the Five Years Prior to the SurveyFor the period of 2003 through 2007, there was an estimated employment of 1,775. Of those 1,775 employed, there were 1,636 examined for a participation rate of 92%. Prevalence of DiseaseOf the 357 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 1.244 mg/m3. Of the 357 miners examined, 18 had 15 or more tenure years:
Distribution of Radiographic FindingsFor the 357 miners examined, the distribution of the miners in the profusion of small opacities categories is:
For the 357 miners examined, the distribution of the miners in the large opacities stages is:
For the 357 miners examined, the distribution for symbol ax is:
Prevalence of Clinical FindingsFor the 357 miners examined, 356 responded to the clinical findings questionnaire.
Smoking StatusFor the 357 miners examined, 355 responded to the cigarette smoking history question on the clinical findings questionnaire.
Spirometry ResultsFor the 357 miners examined, 348 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: July 10, 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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