Table 1.

Characteristics of the Study Population

	Patients With POTS (n=48)	Controls (n=25)	P Value
Age, y	28.6±10.5	30.7±8.6	0.394
Women, n.	91.7	84.0	0.320
SBP, mm Hg	116.73±12.46*	113.60±8.33	0.283
HR, beats per min	69.39±12.27*	65.14±9.87	0.161
ΔSBP, 3 min	−1.00±7.91†	1.24±5.97	0.252
ΔHR, 3 min	26.32±11.75‡	17.64±9.72	0.005
OHQ score	6.36±1.68*	0.67±1.03	< 0.001

Age, heart rate (HR), and systolic blood pressure (SBP) are expressed as mean±SD, whereas the proportion of women and different medications are expressed as percentages of total within each group. ΔHR and ΔSBP refer to the change in HR and SBP from supine to 3 minutes of active standing. P values denote P for independent samples t test or chi‐square test, respectively. OHQ indicates Orthostatic Hypotension Questionnaire; and POTS, postural orthostatic tachycardia syndrome.

Missing values: *n=15; ^†n=19; ^‡n=17.