Selenium concentration, and 4 year Se changes reported by subgroups of exposure to dust in all miners (n=171)
| Occupational exposure to dust | n | Se concentration (ng/ml) | 1994 Se–1990 Se (ng/ml) | p Value | |||||
|---|---|---|---|---|---|---|---|---|---|
| In 1990 | In 1994 | ||||||||
| 1990–4: | |||||||||
| High → high | 48 | 63.5 (10.6) | 59.5 (18.6) | −3.9 (18.5) | 0.14 | ||||
| High → low | 14 | 58.6 (11.4) | 63.3 (20.4) | 4.6 (12.1) | 0.17 | ||||
| High → none (retired) | 18 | 64.0 (10.8) | 70.2 (11.4) | 6.1 (12.6) | 0.05 | ||||
| Low → low | 69 | 64.4 (10.9) | 66.4 (19.0) | 2.0 (18.0) | 0.3 | ||||
| Low → none (retired) | 18 | 66.4 (10.4) | 64.4 (15.9) | −2.0 (20.3) | 0.6 | ||||
| None (retired) → none (retired) | 4 | 65.6 (7.0) | 72.9 (31.2) | 7.3 (30.3) | 0.6 | ||||
Results are expressed as mean (SD).