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Table 4 Observed (Obs) and expected (Exp) numbers of cancer cases (all sites, lung and nasal cancer) and standardised incidence ratios (SIR) with 95% CI during 1967–2011 among workers in the Kokkola cobalt plant during 1969–2013with employment of >1 year, by exposure group

From: Cancer incidence among Finnish male cobalt production workers in 1969–2013: a cohort study

Exposure group All sites Lung, trachea Tongue Bladder
Obs Exp SIR 95% CI Obs Exp SIR 95% CI Obs Exp SIR 95% CI Obs Exp SIR 95% CI
Variable 7 5.02 1.39 0.56–2.87 - 0.55 0.00 0.00–6.68 1 0.04 26.4 0.67–14.0 - 0.25 0.00 0.00–15.0
Low 42 37.8 1.11 0.80–1.50 2 4.89 0.41 0.05–1.47 1 0.15 6.48 0.16–36.1 6 1.96 3.07 1.12–6.67
Moderate 4 6.02 0.66 0.18–1.70 - 0.66 0.00 0.00–5.56 - 0.06 0.00 0.00 - 0.30 0.00 0.00–12.2
High 39 43.6 0.90 0.64–1.22 4 5.95 0.67 0.18–1.72 1 0.16 6.12 0.15–34.1 3 2.32 1.30 0.27–3.78
Total 92 91.9 1.00 0.81–1.22 6 12.0 0.50 0.18–1.08 3 0.41 7.39 1.52–21.6 9 4.79 1.88 0.86–3.56