Results of pilot study
| Contraceptive method | Bleeding pattern | N= | Numbers with low BMD (osteopenia/osteoporosis) | Mean serum oestradiol (range): pmol/L |
| Implant | Amenorrhoea | 22 | 7 | 207(<50–1214) |
| Bleeding | 22 | 3 | 257 (67–917) | |
| POP | Amenorrhoea | 24 | 10 | 145 (<50–259) |
| Bleeding | 4 | 4 | 406 (<50–653) |
BMD, bone mineral density.