Table 4

Selenium concentration, and 4 year Se changes reported by subgroups of exposure to dust in all miners (n=171)

Occupational exposure to dustnSe concentration (ng/ml)1994 Se–1990 Se (ng/ml)p Value
In 1990In 1994
1990–4:
 High → high4863.5 (10.6)59.5 (18.6)−3.9 (18.5)0.14
 High → low1458.6 (11.4)63.3 (20.4)4.6 (12.1)0.17
 High → none (retired)1864.0 (10.8)70.2 (11.4)6.1 (12.6)0.05
 Low → low6964.4 (10.9)66.4 (19.0)2.0 (18.0)0.3
 Low → none (retired)1866.4 (10.4)64.4 (15.9)−2.0 (20.3)0.6
 None (retired) → none (retired)465.6 (7.0)72.9 (31.2)7.3 (30.3)0.6
  • Results are expressed as mean (SD).