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| Treatment Group | Control | P value | |
| 12 months follow‐up | |||
| Randomised | 75 | 75 | |
| Completed | 60 | 63 | |
| Abnormal vaginal bleeding or spotting | 22 | 2 | <0.001 |
| Breast cancer‐related deaths | 0 | 1 | |
| 24 months follow‐up | |||
| Completed | 59 | 62 | |
| Abnormal vaginal bleeding or spotting | 7 | 2 | 0.08 |
| Endometrial polyps | 1 | 10 | 0.02 |
| Endometrial hyperplasia | 0 | 0 | |
| Fibroids | 2 | 4 | 1.0 |
