Table 7: Comparison of Al2O3 concentrations in the air at workstations in the exposed group between subjects without and with symptoms.
Respiratory chronic symptoms | Al2O3 concentrations (mg/m3) in the exposed group (Mean ± SD) | p-Value* | |
Without symptoms | With symptoms | ||
Asthma | 1.12 ± 0.81 | 1.80 ± 0.90 | 0.006** |
Chronic cough | 0.99 ± 0.78 | 1.77 ± 0.82 | 0.001*** |
Morning cough with sputum | 1.14 ± 0.83 | 1.64 ± 0.91 | 0.033* |
Phlegm | 1.27 ± 0.85 | 1.35 ± 1.47 | 0.882 |
Chronic phlegm | 1.32 ± 0.88 | 0.82 ± 0.80 | 0.220 |
Wheeze | 1.21 ± 0.85 | 1.84 ± 0.86 | 0.054 |
Respiratory problems (asthma, coughing) caused by current work | 1.15 ± 0.79 | 2.43 ± 0.76 | 0.001*** |
T-test: *significant at P < 0.05, **significant at P < 0.01, ***significant at P < 0.001.