Table 2.
Observed (Obs) number of lung cancer cases (Observed) and standardized lung cancer incidence ratio (SIR) with 95% confidence intervals (CI) by highest personal blood lead and follow-up category. Bold indicates statistical significance.
| Follow-up a (years) | Highest personal blood lead value (µmol/L) | Test for trend | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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| 0.0–0.4 | 0.5–0.9 | 1.0–1.4 | 1.5–1.9 | 2.0–2.9 | 3.0–7.8 | ||||||||
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| Obs | SIR (CI) | Obs | SIR (CI) | Obs | SIR (CI) | Obs | SIR (CI) | Obs | SIR (CI) | Obs | SIR (CI) | ||
| 0–9 | 10 | 0.85 (0.41–1.56) | 33 | 0.91 (0.63–1.28) | 28 | 1.38 (0.92–1.99) | 16 | 2.01 (1.15–3.26) | 8 | 1.02 (0.44–2.02) | 3 | 0.92 (0.19–2.68) | 0.166 |
| 10–19 | 12 | 0.58 (0.30–1.01) | 66 | 1.10 (0.85–1.40) | 30 | 0.93 (0.63–1.32) | 25 | 2.01 (1.30–2.97) | 25 | 2.06 (1.33–3.04) | 7 | 1.60 (0.64–3.29) | 0.0001 |
| ≥20 | 42 | 0.91 (0.65–1.23) | 163 | 1.13 (0.96–1.32) | 111 | 1.43 (1.18–1.72) | 42 | 1.41 (1.02–1.90) | 42 | 1.67 (1.20–2.26) | 27 | 3.10 (2.04–4.51) | < 0.0001 |
| Overall | 65 | 0.81 (0.62–1.04) | 262 | 1.09 (0.96–1.23) | 169 | 1.30 (1.11–1.51) | 83 | 1.65 (1.32–2.05) | 75 | 1.66 (1.31–2.08) | 37 | 2.26 (1.59–3.12) | < 0.0001 |
a
Time since last measurement