Unadjusted HRs with 95% confidence limits for colorectal cancer according to educational status among full siblings born in Denmark between 1950 and 1979, showing the results from the cohort and intersibling analyses
| Cohort analysis* | Sibling analysis* | |||
|---|---|---|---|---|
| Age at diagnosis/education | HR | 95% CI | HR | 95% CI |
| Colorectal cancer <age 45 | ||||
| Primary school | 1.16 | 0.98 to 1.36 | 1.28 | 0.99 to 1.64 |
| High school | 1.13 | 0.86 to 1.47 | 1.18 | 0.78 to 1.79 |
| Vocational education | 1 | 1 | ||
| Short and middle-length higher education | 1.02 | 0.85 to 1.21 | 0.93 | 0.69 to 1.24 |
| Advanced higher education | 0.89 | 0.68 to 1.15 | 0.87 | 0.57 to 1.32 |
| Trend estimates† | 0.94 | 0.89 to 0.99 | 0.90 | 0.82 to 0.98 |
| Colorectal cancer ≥ age 45 | ||||
| Primary school | 0.97 | 0.82 to 1.15 | 0.72 | 0.51 to 1.00 |
| High school | 0.81 | 0.57 to 1.14 | 0.82 | 0.47 to 1.43 |
| Vocational education | 1 | 1 | ||
| Short and middle-length higher education | 0.93 | 0.77 to 1.13 | 1.02 | 0.71 to 1.47 |
| Advanced higher education | 1.11 | 0.87 to 1.41 | 1.76 | 1.05 to 2.95 |
| Trend estimates† | 1.02 | 0.96 to 1.07 | 1.19 | 1.06 to 1.33 |
*Adjusted for sex.
†For every step up the educational ladder.