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Table 2: Frequency of intravascular injection by anatomic zone^{^a}
Injection Type Anatomic Zone of Identified Vessel No. of Injections
1 2 3 4 5 0
Lumbar ILESI 25% 100% 25% 0% 0% 0% 4
Lumbar TFESI 14% 18% 86% 5% 36% 0% 22
Cervical ILESI 0% 100% 50% 0% 50% 0% 4
Cervical TFESI 29% 0% 71% 0% 14% 14% 7
↵a Percentages across each injection type may sum to >100% because vessels may be visualized in >1 location simultaneously.

Injection Type	Anatomic Zone of Identified Vessel						No. of Injections
Injection Type	1	2	3	4	5	0	No. of Injections
Lumbar ILESI	25%	100%	25%	0%	0%	0%	4
Lumbar TFESI	14%	18%	86%	5%	36%	0%	22
Cervical ILESI	0%	100%	50%	0%	50%	0%	4
Cervical TFESI	29%	0%	71%	0%	14%	14%	7