Placenta accreta is not perfectly diagnosed before birth on ultrasound. Even during elective surgery, the degree of connection of the placenta to the uterine wall is not clear until you try to separate it manually.
Therefore, the elective cesarean is done without knowledge of the placenta accreta. You seem to be asking, was there more or less placenta accreta diagnosed depending on the week of the elective cesarean? But what is the relevance of the question? You are not going to plan to do the cesarean at a time based on the very rare risk of hysterectomy due to placenta accreta. And some placenta accreta separate readily manually, while some do not, but you dont know that until you try to separate it. Did i misunderstand your question?
