Table 1.
Number of persons, person-time, observed and expected number of lung cancer cases and standardized lung cancer incidence ratio (SIR) with 95% confidence intervals (CI) in the cohort follow-up. Bold indicates statistical significance.
| Analysis group | Persons | Person-years | Observed cases | Expected cases | SIR | 95% CI |
|---|---|---|---|---|---|---|
| Whole cohort | 20 729 | 644 842 | 690 | 561 | 1.23 | 1.14–1.32 |
| Men | 18 321 | 567 002 | 638 | 535 | 1.19 | 1.10–1.29 |
| Women | 2408 | 77 840 | 52 | 26.5 | 1.96 | 1.47–2.57 |
| Highest personal blood lead value µmol/L, whole follow–up | ||||||
| 0.0–0.4 | 3236 | 100 880 | 64 | 78.8 | 0.81 | 0.62–1.04 |
| 0.5–0.9 | 8523 | 268 858 | 262 | 241 | 1.09 | 0.96–1.23 |
| 1.0–1.4 | 4643 | 145 170 | 169 | 130 | 1.30 | 1.11–1.51 |
| 1.5–1.9 | 1962 | 60 074 | 83 | 50.2 | 1.65 | 1.32–2.05 |
| 2.0–2.9 | 1720 | 51 234 | 75 | 45.1 | 1.66 | 1.31–2.08 |
| 3.0–7.8 | 645 | 18 625 | 37 | 16.4 | 2.26 | 1.59–3.12 |
| Follow–up time since the last measurement (years) | ||||||
| 0–9 | 201 858 | 98 | 87.4 | 1.12 | 0.91–1.37 | |
| 10–19 | 188 590 | 165 | 142 | 1.16 | 0.99–1.35 | |
| ≥20 | 254 394 | 427 | 332 | 1.29 | 1.17–1.42 |