Table 3. Univariable and multivariable logistic regression analyses for patent track sign.

		Univariable analysis			Multivariable analysis
		OR	95% CI	P	OR	95% CI	P
Age, yrs		0.972	0.938–1.007	0.113
Sex
	Female	1.000	Reference
	Male	1.183	0.499–2.807	0.702
Chronic liver disease or liver cirrhosis		0.473	0.104–1.574	0.265
History of anticoagulation medication		0.328	0.050–1.275	0.157
Platelet, ×103/µL		0.996	0.991–1.001	0.086	0.996	0.991–1.001	0.147
PT (INR)		1.670	0.007–292.561	0.848	4.302	0.008–2092.561	0.642
Tumor size, cm		1.119	1.001–1.283	0.072
Subcapsular location		2.928	1.044–8.148	0.038	3.149	1.059–9.516	0.038
Biopsy protocol
	Conventional method	1.000	Reference		1.000	Reference
	Coaxial method with needle track plugging	0.358	0.139–0.869	0.027	0.360	0.131–0.923	0.038
Biopsy gun type
	Semi-automatic	1.000	Reference
	Automatic	3.047	0.785–20.197	0.157

Variables with a P-value < 0.05 on univariable analysis and crucial hemostasis factors (platelet and INR) were included in the multivariable analysis. During stepwise variable selection using the bidirectional elimination method, none of the four candidate variables were eliminated.

INR = international normalized ratio, OR = odds ratio, CI = confidence interval, PT = prothrombin time