A total of 4.1% of all medical abortions done at less than 12 weeks gestational age were incomplete and required surgical care in the form of a vacuum curettage procedure.
Carlsson, I., Breding, K. & Larsson, PG. Complications related to induced abortion: a combined retrospective and longitudinal follow-up study. BMC Women’s Health 18, 158 (2018). https://doi.org/10.1186/s12905-018-0645-6