Duration of Induction of Labor for Second-Trimester Medication Abortion and Adverse Outcomes.

Objective: To evaluate the relationship between duration of labor during second-trimester medication abortion and adverse outcomes.

Methods: We conducted a retrospective cohort study including all individuals with a singleton gestation undergoing second-trimester medication abortion without evidence of advanced cervical dilation, rupture of membranes, or preterm labor at four centers. The primary exposure was duration of labor (ie, hours spent from receiving misoprostol to fetal expulsion).