Table 3. The cumulative risks at 60 years according to the characteristics of reproductive life and oral contraception for each risk category.
| Hazard Ratio | 95% CI | p-value | |
|---|---|---|---|
| Pregnancy, yes | |||
| VHR | 0.27 | 0.12–0.58 | 0.001 |
| HR | 0.94 | 0.43–2.02 | 0.869 |
| IR | 1.00 | 0.31–3.29 | 0.999 |
| N° of pregnancies, 1 | |||
| VHR | 0.31 | 0.12–0.85 | 0.022 |
| HR | 0.84 | 0.37–1.87 | 0.662 |
| IR | 0.75 | 0.22–2.63 | 0.650 |
| N° of pregnancies, 2 | |||
| VHR | 0.29 | 0.12–0.66 | 0.003 |
| HR | 0.99 | 0.45–2.18 | 0.975 |
| IR | 1.09 | 0.32–3.69 | 0.885 |
| N° of pregnancies, 3 | |||
| VHR | 0.08 | 0.01–0.67 | 0.019 |
| HR | 1.17 | 0.46–2.99 | 0.740 |
| IR | 1.80 | 0.45–7.20 | 0.407 |
| Age at first full term pregnancy, ≤ 30 years | |||
| VHR | 0.49 | 0.19–1.26 | 0.138 |
| HR | 0.62 | 0.38–0.99 | 0.048 |
| IR | 0.61 | 0.29–1.32 | 0.213 |
| Breastfeeding, 1–12 months | |||
| VHR | 0.24 | 0.09–0.66 | 0.005 |
| HR | 1.12 | 0.49–2.58 | 0.784 |
| IR | 1.49 | 0.42–5.22 | 0.536 |
| Breastfeeding, > 12 months | |||
| VHR | 0.25 | 0.08–0.82 | 0.022 |
| HR | 1.91 | 0.79–4.61 | 0.151 |
| IR | 1.86 | 0.49–7.03 | 0.357 |
| Menarche, > 12 years | |||
| VHR | 1.23 | 0.67–2.25 | 0.504 |
| HR | 0.61 | 0.42–0.85 | 0.004 |
| IR | 0.93 | 0.52–1.63 | 0.792 |
| Menopause, > 50 years | |||
| VHR | 0.10 | 0.01–0.82 | 0.033 |
| HR | 0.57 | 0.25–1.32 | 0.192 |
| IR | 0.55 | 0.10–3.00 | 0.489 |
| Abortion, yes | |||
| VHR | 0.61 | 0.20–1.85 | 0.384 |
| HR | 0.99 | 0.59–1.68 | 0.987 |
| IR | 2.63 | 1.18–5.88 | 0.018 |
| CHC use, Current/Past | |||
| VHR | 1.45 | 0.65–3.25 | 0.361 |
| HR | 1.03 | 0.65–1.63 | 0.901 |
| IR | 0.76 | 0.36–1.58 | 0.459 |
| CHC Duration, > 10 years | |||
| VHR | 0.78 | 0.18–3.34 | 0.742 |
| HR | 1.17 | 0.65–2.13 | 0.600 |
| IR | 0.56 | 0.13–2.34 | 0.424 |
Abbreviations: 95% CI = 95% Confidence Interval, VHR = Very High Risk, HR = High Risk, IR = Intermediate Risk.