Hazard ratios: duration of work in the industry
| Duration of exposure (years) | Relative to external control group (n=236) | Relative to internal control group (n=230) | ||
|---|---|---|---|---|
| Hazard ratio | 95% CI | Hazard ratio | 95% CI | |
| With adjustment only for country | ||||
| 0–4 (n=223) | 1.26 | (1.01 to 1.55) | 0.92 | (0.75 to 1.11) |
| 5–9 (n=212) | 1.28 | (1.04 to 1.58) | 0.93 | (0.77 to 1.14) |
| 10–14 (n=114) | 1.09 | (0.85 to 1.40) | 0.79 | (0.63 to 1.01) |
| 15+ (n=68) | 1.82 | (1.36 to 2.43) | 1.33 | (1.00 to 1.77) |
| With adjustment for country, mother’s age, smoking, and primiparity | ||||
| 0–4 (n=223) | 1.24 | (1.00 to 1.54) | 0.92 | (0.76 to 1.12) |
| 5–9 (n=212) | 1.24 | (1.01 to 1.54) | 0.92 | (0.75 to 1.13) |
| 10–14 (n=114) | 1.06 | (0.82 to 1.36) | 0.78 | (0.62 to 1.01) |
| 15+ (n=68) | 1.76 | (1.30 to 2.37) | 1.31 | (0.96 to 1.77) |