Table 3.

Comparison of primary patency and assisted primary patency between the patients with and without history of previous CVC placement in Cox regression model.

	Primary patency		Assisted primary patency
	HR (95%CI)	P-value	HR (95%CI)	P-value
Unadjusted	1.95 (1.02–3.74)	0.044	0.56(0.20–1.63)	0.289
Adjusted*	2.02(0.91–4.48)	0.086	0.71(0.20–2.47)	0.588

^*Adjusted for position of lesion (right or left) and interval time.