Table 2.

Patient characteristics by risk strata for death (low, medium, high) at 2 years following carotid endarterectomy.

	Low Risk of Death at 2Y (riskscore <6) (n=1894)	Medium Risk of Death at 2Y (riskscore 6–12) (n=1164)	High Risk of Death at 2Y (riskscore >12) (n=39)	P-Value
Age (mean in years (SD))	72.2 (4.9)	77.4 (6.1)	78.8 (5.7)	<0.0001
Female (%)	43.0	43.9	38.5	0.74
Past or Current Smoking (%)	69.2	83.4	94.9	<0.0001
Race (%)				0.25
White	97.3	97.4	100.0
Black	0.9	1.5	0.0
Other	1.8	1.1	0.0
Hypertension (%)	89.2	90.8	94.9	0. 2
Coronary Artery Disease (%)	25.0	38.3	66.7	<0.0001
Congestive Heart Failure (%)	1.1	17.5	79.5	<0.0001
Diabetes (%)	27.4	35.8	61.5	<0.0001
COPD* (%)	11.7	32.0	74.4	<0.0001
Renal Function (%)				<0.0001
eGFR†≥60	68.3	30.7	12.8
eGFR<60	31.7	68.3	71.8
Dialysis Dependent	0.0	1.0	15.4
Statin (%)	74.3	88.4	94.9	<0.0001
Contralateral ICA‡ Stenosis (%)				<0.0001
≤ 50%	65.9	39.6	38.5
51–79%	27.8	44.8	35.9
≥ 80%	4.8	5.8	12.8
Occluded	1.5	9.8	12.8
ASA§ class (%)				<0.0001
Class 1	0.7	0.2	3.7
Class 2	13.3	7.7	0.0
Class 3	78.9	78.0	55.6
Class 4	7.2	14.1	40.7
Stress test (%)				0.0 17
None Performed	59.6	60.5	59.0
Normal	31.1	28.6	17.9
Abnormal	9.3	10.9	23.1
Use of Shunt (%)	48.5	49.5	51.3	0.83

^*COPD, chronic obstructive pulmonary disease

^†eGFR, estimated glomerular filtration rate

^‡ICA, internal carotid artery

^§ASA, American Society for Anesthesia