Table 3 ORsa with 95% CIs of colorectal adenocarcinoma according to reproductive factors and subsites, univariate analyses, Nordic countries, 1967–2013
Total | Proximal colon | Distal colon | Rectum | |||||
|---|---|---|---|---|---|---|---|---|
OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | |
Age at first birth (years) | ||||||||
<20 | 0.98 | 0.91–1.06 | 1.01 | 0.88–1.16 | 0.90 | 0.78–1.04 | 1.04 | 0.92–1.18 |
20–29 | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference |
30–39 | 1.08 | 1.02–1.14 | 0.99 | 0.89–1.09 | 1.15 | 1.04–1.27 | 1.07 | 0.98–1.17 |
⩾40 | 1.03 | 0.84–1.26 | 1.12 | 0.78–1.60 | 1.03 | 0.72–1.48 | 0.82 | 0.57–1.19 |
Age at last birth (years) | ||||||||
<20 | 0.94 | 0.78–1.13 | 0.90 | 0.64–1.25 | 0.77 | 0.53–1.12 | 1.12 | 0.84–1.50 |
20–29 | 1.00 | 0.97–1.03 | 0.99 | 1.05–1.11 | 1.00 | 0.94–1.07 | 0.97 | 0.92–1.03 |
30–39 | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference |
⩾40 | 1.01 | 0.95–1.08 | 0.97 | 0.87–1.11 | 1.13 | 1.00–1.27 | 0.98 | 0.87–1.09 |
Parity | ||||||||
1 | 1.04 | 1.00–1.09 | 1.12 | 1.03–1.21 | 0.92 | 0.85–1.01 | 1.07 | 0.99–1.15 |
2 | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference |
3 | 0.99 | 0.96–1.02 | 1.06 | 1.00–1.13 | 0.98 | 0.92–1.04 | 0.94 | 0.89–1.00 |
⩾4 | 1.00 | 0.96–1.04 | 1.01 | 0.94–1.09 | 0.99 | 0.92–1.07 | 0.98 | 0.92–1.05 |
Time since first birth (years) | ||||||||
<10 | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference |
10–19 | 0.94 | 0.84–1.04 | 0.84 | 0.69–1.02 | 1.00 | 0.83–1.21 | 0.94 | 0.79–1.12 |
20–29 | 0.85 | 0.77–1.07 | 0.78 | 0.62–0.98 | 0.86 | 0.69–1.06 | 0.97 | 0.79–1.18 |
⩾30 | 0.86 | 0.75–0.98 | 0.85 | 0.66–1.09 | 0.76 | 0.60–0.96 | 1.00 | 0.80–1.24 |
Time since last birth (years) | ||||||||
<10 | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference | 1.00 | Reference |
10–19 | 0.90 | 0.84–0.97 | 0.89 | 0.77–1.02 | 0.88 | 0.78–1.00 | 0.92 | 0.82–1.04 |
20–29 | 0.92 | 0.84–1.00 | 0.88 | 0.75–1.04 | 0.85 | 0.73–0.98 | 1.00 | 0.87–1.15 |
⩾30 | 0.95 | 0.86–1.04 | 0.98 | 0.82–1.17 | 0.84 | 0.71–1.00 | 1.02 | 0.87–1.19 |
