. Author manuscript; available in PMC: 2011 Jun 22.

Published in final edited form as: J Am Coll Cardiol. 2010 Jun 22;55(25):2858–2868. doi: 10.1016/j.jacc.2010.02.043

Table 1.

Subjects’ characteristics

Variables	POTS Patients (26 women, 1 man)	Healthy Controls (15 women, 1 man)
Age (yr)	26 [21, 33]	28 [23, 35]
Height (cm)	163 [161, 172]	166 [162, 172]
Weight (kg)	64 [57, 70]	63 [56, 68]
Body Mass Index (kg/m²)	23 [22, 26]	22 [21, 24]
Screening
Supine Heart Rate (bpm)	88 [77, 93]^††	72 [64, 77]
10-min Stand Heart Rate (bpm)	114 [108, 131]^††	89 [77, 99]
Changes in Heart Rate (bpm)	32 [24, 38]^††	17 [10, 22]
Supine Hematocrit (%)	39 [37, 40]	38 [36, 40]
Blood Volume (ml/kg)	60 [54, 64]^††	71 [65, 78]
Plasma Volume (ml/kg)	39 [36, 43]^††	49 [44, 52]
Left Ventricular Mass (g/kg)	1.26 [1.12, 1.37]^††	1.45 [1.34, 1.57]
Left Ventricular End-Diastolic Volume (ml/m²)	60 [52, 65]	64 [57, 70]

Values are presented as median [25%, 75%].

^††

P < 0.01 vs healthy controls.