Table I.

Comparison of ADAMTS-13 and vWF levels between males and females and between O blood group and non-O blood group subjects. Results are expressed as median (range).

Parameter (Normal Range)	Males (n=100)	Females (n=100)	P value	O blood group (n=81)	Non-O blood group (n=119)	P value
vWF antigen (50–150%)	85 (21–280)	53 (16–275)	<0.001*	53 (16–275)	68 (18–280)	0.003*
ADAMTS-13 Antigen (70–130%)	67 (13–249)	120 (9–262)	<0.001*	109 (9–262)	93.5 (21–249)	0.286
ADAMTS-13 Activity (40–130%)	95 (25–187)	102 (42–143)	0.429	102 (41–144)	101 (25–187)	0.51

^*Statistically significant difference.