1 in 200 pregnancies (FMC) ... see also overview of Placenta previa.
approx 1 in 13,600 or 0.01% or 20,000 people in USA [Source statistic for calcuation: "1 in 200 pregnancies (FMC)" -- see also general information about data sources]
20,000 per year, 1,666 per month, 384 per week, 54 per day, 2 per hour, 0 per minute, 0 per second. [Source statistic for calculation: "1 in 200 pregnancies (FMC)" -- see also general information about data sources]
16 MEDICAL BOOKS ONLINE! Review excerpts from medical books online, free, without registration, for more information about the prevalence and/or incidence of Placenta previa.
In placenta previa, the placenta may cover all (total, complete, or central), part (partial or incomplete), or a fraction (marginal or low-lying) of the internal cervical os. The degree of placenta previa depends largely on the extent of cervical dilation at the time of examination because the dilating cervix gradually uncovers the placenta. (See Three types of placenta previa.) Although the specific cause of placenta previa is unknown, factors that may affect the site of the placenta’s attachment to the uterine wall include:
❑ defective vascularization of the decidua
❑ multiple pregnancy (the placenta requires a larger surface for attachment)
❑ previous uterine surgery
❑ multiparity
❑ advanced maternal age.
In placenta previa, the uterus’ lower segment fails to provide as much nourishment as the fundus. The placenta tends to spread out, seeking the blood supply it needs, and becomes larger and thinner than normal. Eccentric insertion of the umbilical cord often develops, for unknown reasons. Hemorrhage occurs as the internal cervical os effaces and dilates, tearing the uterine vessels.
This disorder, one of the most common causes of bleeding during the second half of pregnancy, occurs in approximately 1 in 200 pregnancies, more commonly in multigravidas than in primigravidas.
Source: Professional Guide to Diseases (Eighth Edition), 2005
The term 'prevalence' of Placenta previa usually refers to the estimated population of people who are managing Placenta previa at any given time. The term 'incidence' of Placenta previa refers to the annual diagnosis rate, or the number of new cases of Placenta previa diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.
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