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Table 4 Logistic regression of chronic respiratory symptoms and cumulative dust and quartz in quartiles and highest decile of cumulative exposure in a study of male coal miners adjusted for age and ever smoking.

From: High prevalence of respiratory symptoms among workers in the development section of a manually operated coal mine in a developing country: A cross sectional study

Chronic symptoms Exposure groups Exposure (mg·years/m3) n No (%) OR (95% CI)
Cumulative respirable dust
Cough during the day or at night First quartile 0.00–3.47 62 15 (24.2)  
  Second quartile 3.48–9.27 63 14 (22.2) 0.98 (0.43, 2.24)
  Third quartile 9.28–39.00 64 14 (21.9) 0.91 (0.39, 2.09)
  Fourth quartile 39.01–436.75 60 20 (33.3) 1.50 (0.68, 3.35)
  Highest decile 127.44–436.75 24 11 (45.8) 2.91 (1.06, 7.97)
Shortness of breath hurrying on level ground First quartile 0.00–3.47 62 21 (33.9)  
  Second quartile 3.48–9.27 63 15 (23.8) 0.62 (0.28, 1.34)
  Third quartile 9.28–39.00 64 28 (43.8) 1.51 (0.74, 3.12)
  Fourth quartile 39.01–436.75 60 22 (36.7) 1.15 (0.55, 2.44)
  Highest decile 127.44–436.75 24 10 (40.0) 1.37 (0.52, 3.62)
Cumulative quartz
Cough during the day or at night First quartile 0.006–0.1615 62 15 (24.4)  
  Second quartile 0.162–0.432 64 15 (23.4) 0.88 (0.38, 2.04)
  Third quartile 0.433–2.825 61 14 (22.6) 0.88 (0.38, 2.02)
  Fourth quartile 2.826–21.372 62 19 (31.1) 1.61 (0.73, 3.58)
  Highest decile 6.232–21.372 25 11 (45.8) 2.87 (1.05, 7.88)
Shortness of breath hurrying on level ground First quartile 0.006–0.1615 62 31 (33.9)  
  Second quartile 0.162–0.432 64 15 (23.4) 0.57 (0.26, 1.25)
  Third quartile 0.433–2.825 61 28 (45.9) 1.64 (0.79, 3.40)
  Fourth quartile 2.826–21.372 62 22 (35.5) 0.91 (0.42, 1.98)
  Highest decile 6.232–21.372 25 10 (40.0) 1.08 (0.33, 3.57)
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