Factors associated with 4 year Se changes in all miners (n=171)
| Coefficient (SD) | p Value | |
| Change in occupational exposure: | ||
| High → high | −6.80 (3.23) | 0.04 |
| High → low | 2.41 (5.14) | 0.6 |
| High → none (retired) | 8.43 (4.94) | 0.08 |
| Low → none (retired) | −1.95 (4.99) | 0.7 |
| Reference category: low or none (retired) at both surveys | 0.0 | |
| Change in smoking habits: | ||
| Smoker → smoker | 4.12 (3.03) | 0.17 |
| Smoker → ex-smoker | 9.12 (5.48) | 0.09 |
| (Ex-smoker or non-smoker) → smoker | 2.02 (6.60) | 0.7 |
| (Ex-smoker → non-smoker) or (non-smoker → ex-smoker) | −12.71 (5.67) | 0.02 |
| Reference category: ex-smoker or non-smoker at both surveys | 0.0 | |
| Age (y) | −0.71 (0.44) | 0.10 |