Menstrual factors | Deaths | Mortality ratea | Hazard ratio (95% CI)b |
---|---|---|---|
Age at menarch, yearsc | |||
> 14 | 46 | 1.81 | 1.00 (reference) |
> 13 and ≤14 | 71 | 2.19 | 1.26 (0.86–1.84) |
> 11 and ≤13 | 89 | 1.93 | 1.14 (0.79–1.65) |
≤11 | 23 | 2.99 | 1.72 (1.02–2.89) |
Irregular menstruation | |||
No | 253 | 2.16 | 1.00 (reference) |
Yes | 7 | 1.77 | 0.91 (0.43–1.93) |
Cycle length, days | |||
≤27.5 | 39 | 1.79 | 1.00 (reference) |
28 | 95 | 2.16 | 1.15 (0.78–1.68) |
> 28 | 29 | 1.78 | 0.98 (0.60–1.61) |
Total lifetime menstrual cycles, number | |||
≤423 | 58 | 2.10 | 1.00 (reference) |
> 423 and ≤500 | 104 | 2.00 | 0.99 (0.71–1.38) |
> 500 | 57 | 2.09 | 1.04 (0.72–1.52) |
Age at menopause, years | |||
< 50 | 79 | 2.43 | 1.00 (reference) |
50–55 | 138 | 2.18 | 0.92 (0.69–1.22) |
> 55 | 17 | 2.22 | 1.04 (0.60–1.80) |