Table 5. Multivariate analysis of unstable plaques in CAD patients with napkin-ring sign.

Factors	Odds ratio	95% confidence interval	P
Napkin-ring sign	0.062	0.009 to 0.428	0.005
CT value	1.066	1.020 to 1.114	0.004
Degree of stenosis	0.054	0.001 to 2.608	0.140

CAD, coronary artery disease.