Table 2

Relative risk of continuing pregnancy following early medical abortion with different forms of contraception provided at the time of misoprostol administration (n=4838)

Method of contraceptionNumber of
women (%)
Number of women using method with gestation at presentation
≥8 weeks (%)
Number of women using method who had previous abortion (%)Number of continuing pregnancies (n=20)Relative risk (RR) of continuing (95% CI)
Combined contraceptive*1268 (26.2)229 (18.1)382 (30.1)50.90 (0.29 to 2.73)
Progestogen-only pills485 (10.0)90 (18.6)146 (30.1)31.40 (0.37 to 5.26)
Progestogen-only implant797 (16.5)125 (15.7)225 (28.2)30.85 (0.23 to 3.21)
Depot medroxyprogesterone acetate475 (9.8)102 (21.5)141 (29.7)10.48 (0.06 to 3.81)
None/barrier method/fast track*†1813 (37.5)328 (18.1)570 (31.4)81.00 (Ref.)
  • *Number of women using the following methods: combined oral contraception=1182 (pill=1181, patch=79 and ring=8); none=976; condoms=433; diaphragm=2; copper intrauterine device=185; levonorgestrel intrauterine system=215; laparoscopic sterilisation=2.

  • †Women receiving fast-track service for intrauterine device/system (2-week appointment) were not given an interim method by the abortion services therefore they can be grouped with ‘no hormonal contraception’.

  • Ref., reference.