Table 3.

Intravascular ultrasound measurements in patients already receiving clopidogrel at enrolment by groups according to platelet reactivity status (HPR versus no HPR).

	Overall group	HPR	No HPR	P-value
	n=203	n=58	n=145
Reference site*
EEM CSA, mm2	11.6 [9.3, 15.0]	11.9 [10.2, 14.5]	11.4 [9.1, 15.4]	0.461
Lumen CSA, mm2	6.3 [5.0, 7.6]	6.4 [5.3, 7.6]	6.3 [5.0, 7.6]	0.659
Plaque burden	0.46 [0.38, 0.53]	0.47 [0.39, 0.53]	0.46 [0.38, 0.52]	0.592
Minimum Lumen area site
EEM CSA, mm2	10.7 [8.7, 13.9]	10.6 [8.5, 13.9]	10.7 [8.8, 13.9]	0.829
Lumen CSA, mm2	3.0 [2.3, 3.7]	3.0 [2.5, 3.8]	3.0 [2.2, 3.7]	0.485
Plaque&media CSA, mm2	7.5 [5.5, 10.3]	7.7 [5.5, 9.9]	7.5 [5.5, 10.3]	0.714
Plaque burden	0.71 [0.64, 0.77]	0.72 [0.63, 0.77]	0.71 [0.65, 0.78]	0.867
Volumetric Data
EEM volume, mm3	92.3 [55.8, 174.4]	106.4 [67.8, 200.3]	86.8 [51.8, 161.2]	0.0962
Lumen volume, mm3	37.4 [22.6, 59.5]	42.2 [26.3, 69.5]	34.7 [20.5, 53.8]	0.0526
Plaque&media volume, mm3	56.0 [32.9, 110.6]	67.4 [37.4, 127.5]	51.3 [30.9, 102.9]	0.111
Plaque burden	0.62 [0.55, 0.66]	0.61 [0.56, 0.67]	0.62 [0.55, 0.66]	0.822
Lesion length, mm	7.6 [5.3, 13.0]	8.6 [6.4, 14.5]	7.3 [4.9, 12.5]	0.0652
Calcium length, mm	4.4 [1.3, 8.7]	7.0 [2.9, 11.0]	3.8 [1.1, 6.9]	0.0022
Maximum calcium arc, °	100 [40, 180]	125 [70, 270]	90 [33, 165]	0.0055
Calcium index	0.15 [0.03, 0.42]	0.28 [0.07, 0.53]	0.11 [0.02, 0.40]	0.0116
Remodeling index	0.91 [0.79, 1.03]	0.90 [0.78, 1.04]	0.91 [0.80, 1.02]	0.954

^*Calculated as the average of proximal and distal reference sites. EEM = external elastic membrane, CSA = cross sectional area