Oestrogen plus progestogen (Oest + Prog) v placebo for postmenopausal women*
| Outcomes at mean 5.6 years | Oest + Prog | Placebo | Hazard ratio (95% CI) |
|---|---|---|---|
| *CI defined in glossary. | |||
| †Not significant. | |||
| Cases of breast cancer (all) | 245 | 185 | 1.24 (1.02 to 1.50) |
| Cases of invasive breast cancer | 199 | 150 | 1.24 (1.01 to 1.54) |
| Cases of in situ breast cancer | 47 | 37 | 1.18 (0.77 to 1.82)† |