Figure 1.

Gaussian distributions of gestational age at delivery for preeclampsia. In pregnancies at low-risk for preeclampsia (PE), the gestational age distribution is shifted to the right with the implication that most women will actually deliver before developing of PE. In pregnancies at high risk for PE the distribution is shifted to the left and the smaller the mean gestational age the higher is the risk for PE. The probability of PE occurring at or before a specified gestational age is given by the area under the curve (black). In the low-risk group the risk of PE at ≪34 weeks gestation is 1% and in the high-risk group the risk is 60%.

Adapted with permission from [17].