Table 6: Comparison of U-Al concentrations in the exposed group between subjects without and with symptoms.

Respiratory chronic symptoms U-Al concentrations (µg/l) in the exposed group (Mean ± SD) p-Value*
Without symptoms With symptoms
Asthma 96.98 ± 7.64 96.98 ± 7.64 0.073
Chronic cough 95.03 ± 5.64 102.48 ± 8.62 0.001***
Morning cough with sputum 97.19 ± 7.87 99.48 ± 7.43 0.282
Phlegm 97.86 ± 7.71 97.65 ± 9.72 0.957
Chronic phlegm 97.98 ± 7.90 96.23 ± 6.15 0.630
Wheeze 97.42 ± 7.60 100.95 ± 8.74 0.231
Respiratory problems (asthma, coughing) caused by current work 97.01 ± 7.33 104.90 ± 8.26 0.01**

T-test: *significant at P < 0.05, **significant at P < 0.01, ***significant at P < 0.001.