CitationMcMahon, Michael J.; Li, Rongling L.; Schenck, Anne Pittman; Olshan, Andrew F.; & Royce, Rachel A. (1997). Previous Cesarean Birth: A Risk Factor for Placenta Previa. Journal of Reproductive Medicine, 42(7), 409-412.
AbstractObjective: To study the risk of placenta previa following a previous cesarean birth.
Study design: We conducted a population-based, case-control study using 1990 North Carolina state birth certificate data. The study population included 342 women with a pregnancy complicated by placenta previa and 1,082 randomly selected controls. Analysis was restricted to women who reported one or more previous live births and delivered a singleton, live neonate. Adjusted odds ratios (ORs) with 95% confidence intervals (95% CIs) were calculated using logistic regression, controlling for maternal age, race, prior spontaneous or induced abortions and cigarette use.
Results: When the data were adjusted for maternal age, race, prior spontaneous or induced abortions, and cigarette use, women who had a previous cesarean birth and had a parity of 3 were 1.7 times more likely (OR 1.7, 95% CI 0.7, 4.2) and women of parity > or = 4 were 5.5 times more likely (OR 5.5, 95% CI 1.0, 30.1) to have placenta previa than women of parity 1 who had a previous cesarean birth.
Conclusion: Women with a history of a previous cesarean birth and parity > or = 3 were at increased risk of having a pregnancy complicated by placenta previa.
Reference TypeJournal Article
Journal TitleJournal of Reproductive Medicine
Author(s)McMahon, Michael J.
Li, Rongling L.
Schenck, Anne Pittman
Olshan, Andrew F.
Royce, Rachel A.