Table 3: Regression analysis between respiratory problems adjusted with age, duration of work and S-Al/U-Al concentrations.

Respiratory symptoms OR (95% C.I.) AOR (95% C.I.)
Asthma 6.56 (1.43-30.20)*** 6.58 (1.45-30.26)***
Chronic cough 12.50 (2.78-56.24)*** 12.51 (2.79-56.34)***
Morning cough with sputum 8.29 (1.82-37.74)*** 7.69 (1.68-35.12)***
Phlegm 1.95 (1.30-2.91) 1.91 (1.26-2.90)
Chronic phlegm 2.43 (0.48-12.30) 2.43 (0.43-10.10)
Wheeze 4.39 (0.89-21.61) 2.24 (0.41-12.17)
Respiratory problems (asthma, coughing) caused by current work 6.21 (2.89-13.36) 6.00 (2.78-12.94)

*Significant at P < 0.05, **significant at P < 0.01, ***significant at P < 0.001, OR: Odd Ratio; AOR: Adjusted Odd Ratio; S-Al: Serum Aluminum; U-Al: Urinary Aluminum concentrations.