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- Title
Effect of dust exposure and nitrogen oxides on lung function parameters of German coalminers: a longitudinal study applying GEE regression 1974–1998.
- Authors
Morfeld, P.; Noll, B.; Büchte, S. F.; Derwall, R.; Schenk, V.; Bicker, H. J.; Lenaerts, H.; Schrader, N.; Dahmann, D.
- Abstract
Workplace limits for dust and nitrogen oxides are under review in Germany and the EU. We conducted a study on German coal miners to determine the effects of exposure on lung function. Longitudinal inception cohort study (1974–1998) on miners who began working underground at two coal mines between 1974 and 1979. We determined the number of shifts worked underground, the exposure to coal mine dust, quartz dust, nitrogen oxides (NO, NO2), smoking behavior, and three lung function parameters (FVC, FEV1, FEV1/FVC). General estimation equation (GEE) models were fitted. 1,369 miners worked an average 3,017 shifts ( S) underground. The mean respirable coal mine dust concentration was 1.89 mg/m³ (quartz: 0.067 mg/m³), and the nitrogen oxide concentrations were 0.58 ppm (NO) and 0.007 ppm (NO2). On average, 9 measurements of lung function were available per miner. Compared to reference values, the findings were unexceptionable (103, 101, and 99%) on average. GEE-regression models did not reveal detrimental dust exposure effects. Nitrogen oxides (NO x = NO + NO2) showed small but clearly insignificant effects on lung function: ∆ FVC = −0.0008 ml/(220 ppmS), P = 0.86, ∆ FEV1 = −0.003 ml/(220 ppmS), P = 0.50 and ∆ FEV1%FVC = −0.07%/(220 ppmS), P = 0.22. The effect of dust exposure on lung function described in older British and American coal miner studies was not confirmed. This can be explained partly by differences in methods (here: longitudinal studies, no prior exposure), but also by lower dust levels. NO x exposures showed no relevant influence on lung function—a result confirming findings from British coal mining.
- Subjects
GERMANY; DUST diseases; NITROGEN oxide absorption &; adsorption; HEALTH of coal miners; PULMONARY function tests; PUBLIC health; EPIDEMIOLOGY; DISEASE risk factors
- Publication
International Archives of Occupational & Environmental Health, 2010, Vol 83, Issue 4, p357
- ISSN
0340-0131
- Publication type
Article
- DOI
10.1007/s00420-009-0489-3