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.
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) | |