. Author manuscript; available in PMC: 2014 Oct 1.

Published in final edited form as: Clin Pharmacol Ther. 2013 Jun 11;94(4):525–532. doi: 10.1038/clpt.2013.119

Table 1.

Participant Characteristics

	Good responders (N=40)	Poor responders (N=36)	p-value
Demographics
Gender^* (%Men [N])	50% [20]	47% [17]	0.81
Age (year)	44.0±14.4	42.8±12.2	0.69
BMI (kg/m²)	26.5±4.4	26.2±4.3	0.78
Platelet aggregation, collagen 2 μg/mL
Before aspirin (Ω)	13.3±1.9	14.2±1.9	0.05
After aspirin (Ω)	5.7±1.9	14.2±1.9	<0.0001
Change^* (Ω)	-7.6 ±2.1	0.03±2.3	<0.0001
Platelet aggregation, arachidonic acid
Before aspirin (Ω)	9.4±2.8	11.0±3.0	0.02
After aspirin (Ω)	0.4±1.3	2.0±3.5	0.01
Change (Ω)	-9.0 ±3.2	-9.1±4.4	0.97

Samples were categorized as good and poor responders based on change in collagen stimulated ex vivo platelet aggregation and selected to have approximately equal numbers of men and women in each category.