Fig. 3.

Distributions of maximum r[Hb] and minimum rMAP, rCBF, $\mathrm{r}[{\mathrm{HbO}}_2]$, and rTHC in presyncopal and control groups. The circles and triangles represent individuals with and without presyncope, respectively. The asteroids with error bars represent the group $\text{means}\pm \text{standard deviations}$.