Fig. 1.

Effect of treatments on systolic blood pressure (SBP) in subjects with mild to moderate hypertension. Each point on the graph represents the average of at least 25 independent measurements. Error bars Standard error of mean (SEM). **P < 0.01, ***P < 0.001 (placebo vs. Hibiscus sabdariffa), ^ααα P < 0.001 (placebo vs. lisinopril); ^β P < 0.05 (H. sabdariffa vs. lisinopril). All analyses were performed with two-way analysis of variance (ANOVA) with the Bonferroni posttest using the GraphPad Prism 5.0 analysis program