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| Levels of oestrogen/androgena | Women in subcohort (n=380) | Breast cancer cases (n=362) | IRR | 95% CI |
|---|---|---|---|---|
| Low/low | 143 | 113 | 1.0 | — |
| Low/high | 63 | 53 | 1.4 | 0.9–2.3 |
| High/low | 60 | 58 | 1.4 | 0.9–2.3 |
| High/high | 114 | 138 | 1.7 | 1.1–2.4 |
| aBased on the median of the standardised values of each of the hormone levels. IRR, incidence rate ratio. | ||||
