Implant Type and Study | Methodology | No. of Women | No. of Pregnancies | Pregnancy Rate (95% CI) | Period of Use |
---|---|---|---|---|---|
LNG | |||||
Patel11 | Retrospective electronic database | 191a | 6 | 7.1 (1.5, 12.6) | Unknown |
Perry12 | Retrospective chart review | 121 | 15 | 10a | 16.4 months |
Scarsi13 | Prospective clinical | 20 | 3 | 15 | 48 weeks |
ENG | |||||
Patel11 | Retrospective electronic database | 641a | 15 | 5.5 (2.5, 8.4) | Unknown |
Kreitchmann14 | Prospective clinical | 25b | 0 | 0 | 3 years |
Unknown | |||||
Pyra15 | Secondary analysis of prospective study | 9a | 1 | 6 | Unknown |