Fig. 5. Effect of salt on pressor sensitivity. The slope of the BP dose-response curve to infused norepinephrine was calculated, and the slope on the low-salt diet was subtracted from the slope on high-salt diet for each subject. The mean (central line), SE (box), and individual points are portrayed for different groups according to race and diagnosis. Significance of the salt effect in each group: *p < .05; ** p < .01; ***p< .005; ****p < .0025. All = all subjects; Bl = blacks; Wh = whites. Reprinted with permission from Ref. 28.
