Table 2.

Comparison of plaque prevalence and features between Caucasians and Chinese

	Extracranial carotid artery			Intracranial artery
	Caucasians (n=26)	Chinese (n=55)	P value	Caucasians (n=26)	Chinese (n=55)	P value
Plaque	19 (73.1)	27 (49.1)	0.055	10 (38.5)	38 (69.1)	0.02
Presence of luminal stenosis	15 (57.7)	20 (36.4)	0.09	11 (42.3)	40 (72.7)	0.01
Number of plaques per subject*	–	–	–	1.7±0.7	1.7±0.9	0.85
Plaque features
LRNC	16 (61.5)	23 (41.8)	0.15	2 (7.7)	17 (30.9)	0.03
IPH	6 (23.1)	10 (18.2)	0.77	1 (3.9)	2 (3.6)	>0.99
Calcification	7 (26.9)	6 (10.9)	0.10	0	8 (14.6)	0.050
Luminal surface disruption	9 (34.6)	2 (3.6)	<0.001	0	4 (7.3)	0.30
HRP	11 (42.3)	9 (16.4)	0.03	1 (3.9)	6 (10.9)	0.42

Values are number (percentage) or mean±SD.

Bold indicates P-values<0.05.

*Number of plaques was only assessed in intracranial artery.

HRP, high-risk plaque; IPH, intra-plaque haemorrhage; LRNC, lipid-rich necrotic core.