Fig. 1.

Systolic blood pressure (BPsys) in supine and standing positions in 20 patients with a history of mild TBI, 20 patients with a history of moderate or severe TBI (moderate–severe TBI) and 20 healthy controls. In supine position, BPsys was significantly higher in moderate–severe TBI patients than in mild-TBI patients or controls (P < 0.05). Upon standing, healthy controls and mild-TBI patients significantly increased BPsys while moderate–severe TBI patients did not change their BPsys. Data are presented as box plots. The top of the box represents the 75th percentile (upper quartile), the bottom of the box represents the 25th percentile (lower quartile), the line in the middle represents the 50th percentile (median). The ends of the whiskers represent the highest and lowest values that are not outliers or extreme values. White boxes illustrate supine values, and gray boxes illustrate standing values