Table 1.

Study characteristics of the population.

Characteristics	POTS (n = 65)	Healthy controls (n = 65)	p-value
Mean age, years ± SD (age range)	30 ± 9.8 (17–61)	31 ± 9.8 (16–62)	0.37
Female, n (%)	55 (84.6)	52 (80.0)	0.49
Systolic BP supine, mmHg ± SD	116.1 ± 12.6	112.8 ± 10.3	0.11
Diastolic BP supine, mmHg ± SD	71.7 ± 8.8	67.9 ± 7.9	0.01
Heart rate supine, bpm ± SD	70.5 ± 11.6	62.9 ± 10.1	< 0.001
Heart rate 5 min standing, bpm ± SD	108.7 ± 17.4	82.7 ± 12.7	< 0.001

BP blood pressure, bpm beats per minute, POTS postural orthostatic tachycardia syndrome, SD standard deviation.