Table 3.

Postoperative sample characteristics by NLR level

	Overall		Low NLRa		High NLRa
	N	%	N	%	N	%	P-value
Overall	2701	100.0	939	34.7	1762	65.2	--
Age, mean (SD)	68.6	10.9	67.2	11.2	69.3	10.7	<.0001
Gender							<.0001
Female	1070	39.61	421	44.83	649	36.83
Male	1631	60.39	518	55.17	1113	63.17
Race							<.0001
Caucasian	2054	76.05	668	71.14	1386	78.66
African American	484	17.92	199	21.19	285	16.17
Other race	163	6.03	72	7.67	91	5.16
Charlson Index, mean (SD)	2.50	1.62	2.24	1.47	2.64	1.67	<.0001
Procedure type							<.0001
Endovascular	1395	51.65	594	63.26	801	45.46
Open	1306	48.35	345	36.74	961	54.54
PAD Severity							<.0001
Claudication	1384	51.24	569	60.60	815	46.25
Rest pain	408	15.11	133	14.16	275	15.61
Tissue loss	909	33.65	237	25.24	672	38.14
NLR, mean (SD)	6.00	4.22	--	--	--	--	--
Pre-Existing Conditions
Chronic heart disease	1343	49.72	447	47.60	896	50.85	.10
Chronic kidney disease	443	16.40	100	10.65	343	19.47	<.0001
Diabetes	1120	41.47	372	39.62	748	42.45	.15
Outcomes
Renal failure	135	5.00	22	2.34	113	6.41	<.0001
Cardiac/MI	103	3.81	29	3.09	74	4.20	.15
Respiratory problems	135	5.00	24	2.56	111	6.30	<.0001
Infection	313	11.59	66	7.03	247	14.02	<.0001
Amputation	175	6.48	26	2.77	149	8.46	<.0001
In-hospital death	20	0.74	3	0.32	17	0.96	.06
Length of stay, mean (sd)	4.25	5.42	2.70	3.34	5.08	6.09	<.0001
Length of stay > 10 days	266	9.85	35	3.73	231	13.11	<.0001

^aPost-operative NLR Low (< 5.96), High (≥ 5.96).

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