Table 2.

Preoperative sample characteristics by NLR level

	Overall		Low NLRa		High NLRa
	N	%	N	%	N	%	P-value
Overall	1455	100.00	922	63.4	533	36.6	--
Age, mean (SD)	68.3	(11.2)	67.3	(10.9)	70.0	(11.3)	<.0001
Gender							.26
Female	557	38.28	363	39.37	194	36.40
Male	898	61.72	559	60.63	339	63.60
Race							.72
White	1129	77.59	719	77.98	410	76.92
Black	248	17.04	152	16.49	96	18.01
Other race	78	5.36	51	5.53	27	5.07
Charlson Index, mean (SD)	2.76	(1.78)	2.46	(1.59)	3.27	(1.96)	<.0001
Procedure type							.002
Endovascular	874	60.07	581	63.02	293	54.97
Open	581	39.93	341	36.98	240	45.03
PAD Severity							<.0001
Claudication	712	48.93	552	59.87	160	30.02
Rest pain	190	13.06	118	12.80	72	13.51
Tissue loss	553	38.01	252	27.33	301	56.47
NLR, mean (SD)	3.97	(3.41)	--	--	--	--	--
Pre-existing conditions
Chronic heart disease	680	46.74	423	45.88	257	48.22	.38
Chronic kidney disease	289	19.86	126	13.67	163	30.58	<.0001
Diabetes	677	46.53	408	44.25	269	50.47	.02
Outcomes
Renal failure	100	6.87	38	4.12	62	11.63	<.0001
Cardiac/MI	53	3.64	18	1.95	35	6.57	<.0001
Respiratory problems	88	6.05	41	4.45	47	8.82	.0008
Infection	246	16.91	109	11.82	137	25.70	<.0001
Amputation	137	9.42	40	4.34	97	18.20	<.0001
In-hospital death	19	1.31	4	0.43	15	2.81	.0001
Length of stay, mean (SD)	5.12	(7.9)	3.57	(6.56)	7.81	(9.18)	<.0001
Length of stay > 10 days	223	15.33	74	8.03	149	27.95	<.0001

^aPre-operative NLR Low (< 3.65), High (≥ 3.65).

PAD = peripheral arterial disease; SD = standard deviation; MI = myocardial infarction; NLR = neutrophil to lymphocyte ratio