Fig. 2

Forest plot of the ratio of means (ROM) of the active plasma renin concentrations (APRC) during healthy pregnancy at < 14 weeks, 15–21 weeks, 22–28 weeks, 29–35 weeks and 36–41 weeks of gestation compared to reference values in non-pregnancy, preconception or postpartum. Only studies with more than 4 subjects are included. 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