Final answer:
The risk of placenta previa increases with the number of previous Cesarean sections a woman has. The specific percentages for each increase are not provided, but the overall incidence in pregnancies is roughly 0.5 percent.
Step-by-step explanation:
Placenta previa is a condition where the placenta partially or completely covers the opening of the cervix. The risk of developing placenta previa increases with the number of previous cesarean sections (CS) a woman has had. Specifically:
- (a) For women with 1 previous Cesarean section, the risk is higher than in those without any previous Cesarean sections.
- (b) For women with 2 previous Cesarean sections, the risk increases further.
- (c) Women with ≥ 3 previous Cesarean sections have an even higher risk of placenta previa.
While I do not have the exact percentages for each scenario, it is well established in the medical community that the risk of placenta previa increases with the number of cesarean deliveries a woman has undergone. The overall incidence of placenta previa in pregnancies is approximately 0.5 percent.