| Body mass index (kg/m2) | p for interaction | ||||
---|---|---|---|---|---|---|
< 18.5 | 18.5–23 | 23–25 | 25–30 | ≥30 | ||
Age at menarche (years) | Â | Â | Â | Â | Â | 0.0033 |
  ≤ 12 | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) |  |
 13–14 | 1.04 (0.48–2.25) | 1.01 (0.87–1.16) | 1.30 (1.09–1.55) | 1.01 (0.88–1.14) | 0.92 (0.69–1.22) |  |
 15–16 | 1.39 (0.66–2.95) | 1.08 (0.93–1.24) | 1.30 (1.09–1.54) | 0.96 (0.85–1.09) | 0.91 (0.69–1.20) |  |
  > 16 | 1.38 (0.65–2.93) | 1.11 (0.96–1.28) | 1.34 (1.13–1.60) | 1.00 (0.88–1.13) | 0.94 (0.71–1.24) |  |
Age at menopause (years) | Â | Â | Â | Â | Â | 0.6741 |
  < 40 | 1.31 (0.82–2.07) | 1.20 (1.07–1.34) | 1.05 (0.92–1.20) | 1.10 (0.99–1.21) | 1.17 (0.95–1.43) |  |
 40–44 | 1.29 (1.00–1.68) | 1.04 (0.97–1.11) | 1.06 (0.99–1.14) | 1.09 (1.03–1.16) | 0.94 (0.83–1.08) |  |
 45–49 | 0.98 (0.83–1.15) | 1.03 (1.00–1.07) | 1.03 (0.99–1.06) | 1.02 (0.99–1.06) | 1.01 (0.94–1.09) |  |
 50–54 | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) |  |
  ≥ 55 | 0.97 (0.73–1.29) | 0.98 (0.93–1.03) | 0.98 (0.93–1.03) | 0.95 (0.92–0.99) | 0.95 (0.86–1.04) |  |
Reproductive span | Â | Â | Â | Â | Â | 0.5289 |
  < 30 | 1.08 (0.75, 1.55) | 1.10 (1.02, 1.18) | 1.07 (0.99, 1.15) | 1.13 (1.06, 1.19) | 1.05 (0.92, 1.19) |  |
 30–34 | 0.95 (0.68, 1.33) | 1.07 (1.00, 1.14) | 1.04 (0.97,1.10) | 1.06 (1.01, 1.11) | 1.07 (0.95, 1.20) |  |
 35–39 | 0.82 (0.58, 1.15) | 1.03 (0.96, 1.10) | 0.99 (0.93, 1.05) | 1.04 (0.99, 1.10) | 1.01 (0.90, 1.13) |  |
  ≥ 40 | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) |  |
Oral contraceptives (years) | Â | Â | Â | Â | Â | 0.1990 |
 Never | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) |  |
  < 1 | 1.12 (0.88–1.43) | 1.04 (0.99–1.09) | 1.01 (0.96–1.06) | 1.04 (1.00–1.08) | 1.00 (0.91–1.11) |  |
  ≥ 1 | 1.13 (0.83–1.54) | 1.12 (1.06–1.18) | 1.04 (0.98–1.10) | 1.01 (0.96–1.06) | 1.05 (0.94–1.18) |  |
Hormone replacement therapy (years) | Â | Â | Â | Â | Â | 0.4493 |
 Never | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) |  |
  < 2 | 1.22 (0.99–1.52) | 1.19 (1.14–1.24) | 1.16 (1.10–1.21) | 1.13 (1.09–1.18) | 1.11 (0.99–1.24) |  |
 2–5 | 0.91 (0.63–1.31) | 1.17 (1.10–1.24) | 1.19 (1.11–1.28) | 1.15 (1.08–1.23) | 1.11 (0.91–1.35) |  |
  ≥ 5 | 1.01 (0.67–1.53) | 1.21 (1.13–1.30) | 1.21 (1.12–1.31) | 1.15 (1.07–1.24) | 1.16 (0.89–1.40) |  |
Parity | Â | Â | Â | Â | Â | 0.9025 |
 0 children | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) |  |
 1 child | 1.36 (0.88–1.96) | 0.98 (0.89–1.09) | 1.03 (0.91–1.15) | 0.98 (0.88–1.08) | 0.94 (0.73–1.21) |  |
  ≥ 2 children | 1.11 (0.76–1.64) | 0.96 (0.87–1.05) | 1.02 (0.92–1.13) | 0.99 (0.91–1.09) | 1.00 (0.80–1.26) |  |
Breastfeeding (months) | Â | Â | Â | Â | Â | 0.6125 |
 Never | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) | 1 (Ref.) |  |
  < 6 | 0.84 (0.62–1.14) | 1.00 (0.93–1.08) | 0.90 (0.82–0.98) | 0.90 (0.83–0.98) | 0.91 (0.74–1.11) |  |
 6–12 | 0.81 (0.61–1.08) | 1.02 (0.95–1.08) | 0.96 (0.89–1.03) | 0.95 (0.89–1.02) | 0.95 (0.81–1.12) |  |
  ≥ 12 | 0.91 (0.71–1.18) | 1.05 (0.99–1.12) | 0.97 (0.91–1.04) | 0.97 (0.91–1.03) | 0.95 (0.82–1.10) |  |