Table 5.

Cox regression analysis of factors associated with primary patency.

Variable	Univariate analysis				Multivariate analysis
	B	HR	95% CI	P	B	HR	95% CI	P
Diabetes	.423	.793	.415–5.609	.524	.597	.875	0.415–4.233	.671
Active tobacco use	.244	.406	.377–4.297	.696	.244	.390	0.820–4.681	.642
Chronic kidney disease	.542	.890	.188–1.051	.345	.542	.890	0.538–4.567	.831
Runoffa	1.412	7.698	1.221–10.501	.005	1.885	7.906	1.411–14.294	.005
PACCS	1.722	5.480	1.331–21.429	.019	1.032	5.571	1.531–24.234	.019
TASC AB + CD	.631	1.331	0.542–1.543	.172	0.711	0.915	0.339–12.230	.249
Calcification severityb	3.953	5.731	1.324–2.111	.017	4.243	5.314	1.334–5.433	.017
Use of stents (yes/no)	.596	5.313	1.093–3.012	.021	.596	5.314	1.212–3.555	.021
Lesion lengthc	.607	1.292	0.191–1.552	.256	.225	0.067	0.146–4.369	.795
Dialysis chronic kidney failure (CKF)	.978	.332	0.049–2.257	.260	.226	.0898	0.456–2.354	.260
Rutherford 4/5 + 6	.676	.716	0.483–7.990	.345	.676	.891	0.483–7.890	.345
Cardiac failure	.930	.906	0.522–12.304	.249	.567	.930	.522–11.365	.622
Cilostazol use	1.475	2.214	0.006–2.006	2.194	1.475	.111	.006–2.345	.137
Vessel diameterd	1.456	2.567	1.567–3.889	0.03	1.345	2.787	1.345–3.903	0.03

B: coefficient; HR: hazard ratio; CI: confidence interval; TASC: Trans-Atlantic Inter-Society Consensus.

^aTwo tibial vessels vs. one tibial vessel + popliteal artery isolated segment.

^bHigh severity score (>2) vs. moderate severity score (<2).

^cLesion length > 6 cm vs. < 6 cm.

^dVessel diameter < 4mm ≥ 4mm—popliteal/superficial femoral artery.