Table 3.

Chi-squared test of histological parameters of different CS groups

Feature	Mild CS (N=21)	Moderate CS (N=52)	Severe CS (N=29)	P-values
LRNC	12 (57.1%)	35 (67.3%)	24 (82.8%)	0.013*
IPH	3 (14.3%)	5 (9.6%)	3 (10.3%)	0.84
FCSR	1 (4.8%)	1 (1.9%)	1 (3.5%)	0.95

Notes: Discrete data are presented as counts and percentages;

^*P<0.05.

Abbreviations: CS, calcification score; FCSR, fibrous cap surface rupture; IPH, intraplaque hemorrhage; LRNC, lipid-rich necrotic nucleus.