Table 3. Agreement between assays on the designation of poor responsiveness.

The agreement between assays and conditions for categorizing subjects as poor responders was assessed using the kappa statistic. Poor responders were defined as having baseline platelet function more than twice the standard error over mean response. PRU = P2Y12 reaction units, MPA = maximal platelet aggregation, and RPA = residual platelet aggregation.

		Kappa Statistic
PRU	MPA 5	0.85
PRU	MPA 20	0.46
PRU	RPA 5	1.00
PRU	RPA 20	0.30
MPA 5	MPA 20	0.62
MPA 5	RPA 5	0.85
MPA 5	RPA 20	0.43
MPA 20	RPA 5	0.46
MPA 20	RPA 20	0.33
RPA 5	RPA 20	0.30