Table 3:

Arterial, venous, and secondary neck vessel frequency and the cross-sectional area in the study groups^{^a}

	Primary Vessel (CSA) (mm²)
	Arterial and Venous			Arterial (VAs)
	MS (n = 193)	HC (n = 193)	P Value	MS (n = 193)	HC (n = 193)	P Value
Arterial (CCA/ICA/ECA)
C2/C3	55.1 (16.4)	60.9 (17.9)	.030^{^b}	20.1 (4.4)	21.8 (5.8)	.02^{^b}
C4	60.8 (15.7)	63.4 (16.3)	.229	18.6 (4.2)	20.3 (5.0)	.012^{^b}
C5/C6	50.1 (10.1)	53.9 (12.5)	.026^{^b}	18.1 (6.9)	19.3 (4.7)	.341
C7/T1	47.6 (9.8)	52 (9.9)	.005^{^b}	16.3 (4.5)	18.4 (5.9)	.006^{^b}
Venous (IJVs)
C2/C3	64.9 (27.4)	66.0 (31.6)	.621
C4	86.9 (35.9)	91.1 (41.0)	.140
C5/C6	92.3 (57.1)	97.4 (60.2)	.418
C7/T1	113.3 (67.0)	117.9 (79.3)	.790

↵a Analysis of covariance adjusted for age and BMI, smoking history, heart disease, and hypertension was used. In the ANCOVA for frequency of vessels, ranked variables were used.
↵b An α level of .05 was considered significant.