Fig 1. Flowchart from pregnancies included in the observational study as part of the Hasselt University Study Project on Maternal Venous Hemodynamics.

1620 pregnant women were classified based upon diagnosis in gestational hypertension (GH), late preeclampsia (LPE), early preeclampsia (EPE), essential hypertension (EH), uncomplicated pregnancy (UP) with or without small for gestational age (SGA) neonates. Assessments per patient were done in the first, second or third trimester (1T, 2T, 3T resp.) alone or in multiple trimesters.