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Table 2: NF and radicular branches providing ARMA lumen diameter measurements^{^a}
Vertebral Level No. Measurement Mean Range SD
Thoracic ARMAs 55 NF height 16.2 9.7–21.2 2.4
NF width 8.0 5.4–12.7 1.8
ARMA diameter 1.0 0.6–1.4 0.2
Lumbar ARMAs 23 NF height 20.6 14.8–25 2.3
NF width 10.3 8.1–13.6 1.4
ARMA diameter 1.1 0.7–1.7 0.3
All ARMAs 78 NF height 17.5 9.7–25 3.1
NF width 8.7 5.4–13.6 2.0
ARMA diameter 1.0 0.6–1.7 0.2
↵a Data are in millimeters.

Vertebral Level	No.	Measurement	Mean	Range	SD
Thoracic ARMAs	55	NF height	16.2	9.7–21.2	2.4
		NF width	8.0	5.4–12.7	1.8
		ARMA diameter	1.0	0.6–1.4	0.2
Lumbar ARMAs	23	NF height	20.6	14.8–25	2.3
		NF width	10.3	8.1–13.6	1.4
		ARMA diameter	1.1	0.7–1.7	0.3
All ARMAs	78	NF height	17.5	9.7–25	3.1
		NF width	8.7	5.4–13.6	2.0
		ARMA diameter	1.0	0.6–1.7	0.2