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Table 2: Correlations of arterial, venous, and secondary neck vessel frequency and the cross-sectional area with age and BMI in study groups^{^a}
Age Body Mass Index
MS (n = 193) HC (n = 193) MS (n = 193) HC (n = 193)
R Value P Value R Value P Value R Value P Value R Value P Value
Arterial CSA (mm²) 
    C2/3 −0.156 .031^{^b} −0.163 .023^{^b} 0.130 .085 0.059 .449
    C4 0.075 .298 0.045 .534 0.037 .626 −0.017 .830
    C5/6 0.103 .156 0.122 .092 0.136 .073 0.095 .224
    C7/T1 −0.049 .502 −0.003 .968 0.085 .266 0.047 .548
IJV CSA (mm²) 
    C2/3 0.257 <.001^{^b} 0.150 .37 0.098 .198 0.083 .287
    C4 0.255 <.001^{^b} 0.177 .14^{^b} 0.146 .054 0.139 .075
    C5/6 0.196 .006^{^b} 0.252 <.001^{^b} 0.339 <.001^{^b} 0.231 .003^{^b}
    C7/T1 0.187 .009^{^b} 0.327 <.001^{^b} 0.375 <.001^{^b} 0.344 <.001^{^b}
Secondary CSA (mm²) 
    C2/3 0.039 .594 −0.060 .404 −0.192 .011^{^b} −0.074 .347
    C4 0.112 .122 −0.040 .584 −0.229 .002^{^b} −0.121 .121
    C5/6 0.047 .518 0.028 .696 −0.214 .004^{^b} −0.064 .417
    C7/T1 0.061 .398 −0.049 .498 −0.078 .307 −0.065 .405
No. of vessels 
    C2/3 0.013 .860 −0.149 .039^{^b} −0.204 .007^{^b} −0.153 .050^{^b}
    C4 −0.460 .527 −0.211 .003^{^b} −0.292 <.001^{^b} −0.316 <.001^{^b}
    C5/6 −0.076 .294 −0.141 .050^{^b} −0.333 <.001^{^b} −0.251 .001^{^b}
    C7/T1 −0.060 .406 −0.155 .031^{^b} −0.180 .017^{^b} −0.174 .025^{^b}
↵a Spearman ranked correlations between age/BMI and the corresponding vascular variable were used.
↵b An α level of .05 was considered significant.

	Age				Body Mass Index
	MS (n = 193)		HC (n = 193)		MS (n = 193)		HC (n = 193)
	R Value	P Value	R Value	P Value	R Value	P Value	R Value	P Value
Arterial CSA (mm²)
C2/3	−0.156	.031^{^b}	−0.163	.023^{^b}	0.130	.085	0.059	.449
C4	0.075	.298	0.045	.534	0.037	.626	−0.017	.830
C5/6	0.103	.156	0.122	.092	0.136	.073	0.095	.224
C7/T1	−0.049	.502	−0.003	.968	0.085	.266	0.047	.548
IJV CSA (mm²)
C2/3	0.257	<.001^{^b}	0.150	.37	0.098	.198	0.083	.287
C4	0.255	<.001^{^b}	0.177	.14^{^b}	0.146	.054	0.139	.075
C5/6	0.196	.006^{^b}	0.252	<.001^{^b}	0.339	<.001^{^b}	0.231	.003^{^b}
C7/T1	0.187	.009^{^b}	0.327	<.001^{^b}	0.375	<.001^{^b}	0.344	<.001^{^b}
Secondary CSA (mm²)
C2/3	0.039	.594	−0.060	.404	−0.192	.011^{^b}	−0.074	.347
C4	0.112	.122	−0.040	.584	−0.229	.002^{^b}	−0.121	.121
C5/6	0.047	.518	0.028	.696	−0.214	.004^{^b}	−0.064	.417
C7/T1	0.061	.398	−0.049	.498	−0.078	.307	−0.065	.405
No. of vessels
C2/3	0.013	.860	−0.149	.039^{^b}	−0.204	.007^{^b}	−0.153	.050^{^b}
C4	−0.460	.527	−0.211	.003^{^b}	−0.292	<.001^{^b}	−0.316	<.001^{^b}
C5/6	−0.076	.294	−0.141	.050^{^b}	−0.333	<.001^{^b}	−0.251	.001^{^b}
C7/T1	−0.060	.406	−0.155	.031^{^b}	−0.180	.017^{^b}	−0.174	.025^{^b}