Clinical characteristics of study population (n = 671) including haemodynamic parameters observed during head-up tilt test.

All values are given as mean ± standard deviation, unless otherwise stated. Clinical characteristics of study population (n = 671) including haemodynamic parameters observed during head-up tilt test.除非另有说明，所有数值均以平均值±标准差（mean ± standard deviation）表示。本研究人群（n = 671）的临床特征涵盖直立倾斜试验（head-up tilt test）中观测到的血流动力学参数（haemodynamic parameters）。