|
Active miners (n=131)
|
Retired miners (n=40)
|
p Value
|
Age (y, mean (SD)) | 45.6 (3.2) | 49.7 (2.0) | 0.0001 |
Estimated cumulative exposure to dust (mg/m3.y, mean (SD)) | 51.2 (41.4) | 67.2 (44.2) | 0.04 |
Smoking (%): |
Non-smokers | 23 | 25 | |
Ex-smokers | 22 | 45 | 0.008 |
Current smokers | 55 | 30 | |
Selenium concentration (ng/ml, mean (SD)) | 63.6 (19.1) | 67.9 (15.9) | 0.2 |
Plasma GSH-Px (U/l, mean (SD)) | 694 (234) | 748 (227) | 0.2 |
Erythrocyte GSH-Px (U/g Hb, mean (SD)) | 38.8 (12.5) | 44.6 (13.7) | 0.01 |
Adjusted means: |
Age and smoking adjusted Se concentration (ng/ml) | 62.6 | 72.2 | 0.01 |
Age and smoking adjusted plasma GSH-Px (U/l) | 680 | 785 | 0.04 |
Age and smoking adjusted erythrocyte GSH-Px (U/g Hb) | 38.5 | 46.5 | 0.003 |