Cancer site | Length (in tertiles)* | N of exposed cases | OR† | (95% CI) | P for trend‡ |
All cancers | Short | 685 | 0.94 | (0.86 to 1.03) | <0.01 |
Moderate | 1333 | 0.99 | (0.92 to 1.06) | ||
Long | 2481 | 1.13 | (1.07 to 1.19) | ||
Lung | Short | 104 | 1.59 | (1.20 to 2.11) | <0.01 |
Moderate | 235 | 2.12 | (1.74 to 2.59) | ||
Long | 385 | 1.82 | (1.56 to 2.13) | ||
Oesophagus | Short | 16 | 1.19 | (0.62 to 2.27) | <0.01 |
Moderate | 38 | 1.77 | (1.09 to 2.87) | ||
Long | 63 | 1.73 | (1.18 to 2.55) | ||
Stomach | Short | 98 | 0.91 | (0.71 to 1.16) | 0.11 |
Moderate | 215 | 0.95 | (0.80 to 1.13) | ||
Long | 405 | 1.15 | (1.01 to 1.32) | ||
Colorectal | Short | 121 | 1.16 | (0.92 to 1.46) | 0.60 |
Moderate | 192 | 0.94 | (0.79 to 1.13) | ||
Long | 319 | 0.96 | (0.84 to 1.11) | ||
Liver | Short | 32 | 0.84 | (0.54 to 1.30) | 0.33 |
Moderate | 84 | 1.05 | (0.78 to 1.41) | ||
Long | 124 | 0.87 | (0.68 to 1.10) | ||
Biliary tract | Short | 9 | 0.78 | (0.35 to 1.73) | 0.64 |
Moderate | 13 | 0.65 | (0.34 to 1.26) | ||
Long | 46 | 1.25 | (0.81 to 1.91) | ||
Pancreas | Short | 16 | 1.61 | (0.82 to 3.17) | <0.01 |
Moderate | 34 | 1.53 | (0.95 to 2.46) | ||
Long | 65 | 2.03 | (1.40 to 2.94) | ||
Bladder | Short | 40 | 1.23 | (0.82 to 1.85) | <0.01 |
Moderate | 82 | 1.44 | (1.06 to 1.94) | ||
Long | 155 | 1.40 | (1.12 to 1.74) |
*The median (range) length of employment was 10 (1–17), 28 (18–34) and 41 (32–58) years for short, moderate and long, respectively.
†ORs and 95% CIs were calculated using conditional logistic regression with multiple imputation, matched for age categories (5-year categories), hospital (34 hospitals) and admitted year (1-year) with additional adjustment for smoking status, alcohol consumption status and longest occupation held (the reference categories were never exposed).
‡Trend test was performed for the associations between exposed length as a continuous variable and cancer incidence.