Prevalence and Incidence of Preeclampsia


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About prevalence and incidence statistics: The term 'prevalence' of Preeclampsia usually refers to the estimated population of people who are managing Preeclampsia at any given time. The term 'incidence' of Preeclampsia refers to the annual diagnosis rate, or the number of new cases of Preeclampsia 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.

Incidence (annual) of Preeclampsia: 146,320 cases (1998/NHLBI); about 5% of pregnancies.
Incidence Rate: approx 1 in 1,858 or 0.05% or 146,320 people in USA [about data]
Prevalance of Preeclampsia: Preeclampsia is the most common hypertensive disorder during pregnancy, affecting an estimated 5-8% of pregnant women annually in the United States, and has the greatest effect on maternal and infant outcome.1
Incidence of Preeclampsia: High blood pressure problems occur in 6 percent to 8 percent of all pregnancies in the U.S., about 70 percent of which are first-time pregnancies. In 1998, more than 146,320 cases of preeclampsia alone were diagnosed.2

Prevelance of Preeclampsia discussion: Although the proportion of pregnancies with gestational hypertension and eclampsia has remained about the same in the U.S. over the past decade, the rate of preeclampsia has increased by nearly one-third. This increase is due in part to a rise in the numbers of older mothers and of multiple births, where preeclampsia occurs more frequently. For example, in 1998 birth rates among women ages 30 to 44 and the number of births to women ages 45 and older were at the highest levels in 3 decades, according to the National Center for Health Statistics. Furthermore, between 1980 and 1998, rates of twin births increased about 50 percent overall and 1,000 percent among women ages 45 to 49; rates of triplet and other higher-order multiple births jumped more than 400 percent overall, and 1,000 percent among women in their 40s. 2

Footnotes:
1. excerpt from REPORT of the WORKING GROUP on RESEARCH on HYPERTENSION DURING PREGNANCY: NHLBI
2. excerpt from High Blood Pressure in Pregnancy: NHLBI

Last revision: June 12, 2003

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