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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.

	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}