Table 4:

Secondary neck vessel frequency and the cross-sectional area in the study groups^{^a}

	No. of Vessels			CSA (mm²)
	MS (n = 193)	HC (n = 193)	P Value	MS (n = 193)	HC (n = 193)	P Value
Secondary vessels
C2/C3	12.9 (5.4)	10 (4.2)	<.001^{^b}	92.1 (40.6)	81.6 (35.5)	.016^{^b}
C4	9.1 (4.2)	7.5 (3.3)	<.001^{^b}	71.0 (33.7)	65.3 (28.7)	.022^{^b}
C5/C6	7.8 (3.9)	6.8 (3.4)	.012^{^b}	61.9 (32.2)	57.2 (28.2)	.028^{^b}
C7/T1	8.8 (4.9)	6 (3.5)	<.001^{^b}	71.1 (40.5)	56.7 (32.5)	<.001^{^b}

↵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.