Figures & Tables
Tables
- TABLE 1.
Pregnancy Data Among LNG- and ENG-Releasing Subdermal Implant Users Through 5 Years of Use From Ali et al., 201618
LNG-Releasing Implant ENG-Releasing Implant Years 1–3a Year 4a Year 5 Years 1–5 (Cumulative) Years 1–3a Year 4a Year 5 Years 1–5 (Cumulative) No. of women 997 470 330 995 311 204 Woman-months of observation 28670 6,254 4,629 30,325 28786 4,606 2,454 22,044 No. of pregnancies 3b 0 0 3 3b 0 0 3 Cumulative pregnancy rates per 100 woman-yearsc (95% CI) 0.4 (0.1–1.4) 0.8 (0.2, 2.3) 0.4 (0.1–1.4) 0.6 (0.2, 1.8) Abbreviations: CI, confidence interval; ENG, etonogestrel; LNG, levonorgestrel.
↵a Cut-off for 3 years was at 38 months post-insertion while year-4 data started at 36 months post-insertion, resulting in a 2-month overlap in data. Woman-months of observation between these 2 time periods, however, is not additive.
↵b Pregnancy data from the first 3 years reported in Bahamondes et al., 2015.22
↵c Kaplain-Meier rates.
- TABLE 2.
Pregnancy Data Among ENG-Releasing Implant Users Through 5 Years From McNicholas et al., 201717
Year 4 Year 5 No. of women 223 102 Woman-years of observation 444.0 No. of pregnancies 0 0 Pregnancy rate per 100 woman-years (1-sided 97.5% CI) 0 (0, 1.48) 0 (0, 2.65) Abbreviations: CI, confidence interval; ENG, etonogestrel.
- TABLE 3.
Comparative Efficacy of the TCu380A IUD and the 52-mg LNG IUS Over 7 Years From Rowe et al., 201623
TCu380A IUD LNG IUS No. of women 1,871 1,884 Woman-years of observation 10,088 7,903 No. of pregnancies 33 7a Cumulative pregnancy rate per 100 woman-years (95% CI) 2.5 (2.1, 2.9) 0.5 (0.3, 0.8) Abbreviations: CI, confidence interval; IUD, intrauterine device; LNG IUS, levonorgestrel-releasing intrauterine system.
↵a No pregnancies were reported in years 6 and 7.
Year 6 Year 7 No. of women 496 Woman-years of observation 696.9 No. of pregnancies 2 Pregnancy rate per 100 woman-years (95% CI) 0.25 (0.04, 1.42) 0.43 (0.08, 2.39) Abbreviations: CI, confidence interval; LNG IUS, levonorgestrel-releasing intrauterine system.
