Table 1.

Demographic characteristics for control subjects and POTS patients

	Control Subjects		POTS Patients
	Men	Women	Men	Women
Age, yr	23 ± 3	23 ± 4	20 ± 5	21 ± 4
Weight, kg	84 ± 11	63 ± 5*	78 ± 7	58 ± 7*
Height, cm	178 ± 6	165 ± 4*	176 ± 5	167 ± 8*
Hemoglobin, g/dl	14.5 ± 0.6	13.1 ± 0.6*	14.1 ± 0.9	13.2 ± 0.8*

Data are shown means ± SD; n = 12 control subjects and 17 postural tachycardia syndrome (POTS) patients.

^*P < 0.05, men compared with women. There were no significant differences when control subjects were compared with POTS patients.