Table 4. Results of Multivariate Logistic Regression Analysis including Either (a) Presence of Protrusion or (b) Protrusion Ratio.

CT Findings	Odds Ratio	95% CI	P
(a)*
Long-axis diameter (cm)	2.573	0.991–6.682	0.052
Presence of protrusion	9.855	1.749–55.535	0.009
Lobulated contour	5.598	0.761–41.194	0.091
Pre-contrast attenuation ≥ 35 HU	4.808	0.654–35.337	0.123
Post-contrast attenuation ≥ 60 HU	12.734	2.506–64.705	0.002
(b)*
Long-axis diameter (cm)	2.574	0.983–6.743	0.054
Protrusion ratio ≥ 13%	9.346	1.638–53.318	0.012
Lobulated contour	6.449	0.927–44.858	0.060
Pre-contrast attenuation ≥ 35 HU	5.329	0.731–38.837	0.099
Post-contrast attenuation ≥ 60 HU	13.145	2.602–66.417	0.002

^*Other variables were removed from analysis using backward enter model, in which variables that show low significance level with p value larger than 0.1 are removed from regression model. CI = confidence interval