Fig. 3

Forest plot of the ratio of means (ROM) of the active plasma renin concentrations (APRC) during hypertensive complicated pregnancy at 29–35 weeks and 36–41 weeks of gestation compared to reference values in non-pregnancy, preconception or postpartum. Studies that are reported more than once provide data for different gestational weeks within the same study. Only the first author of each study is given. GA = gestational age in weeks, SD = standard deviation, CI = confidence interval, PE = preeclampsia, PIH = pregnancy induced hypertension