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Table 1: Needle tip, mean angle, and contrast distribution by nerve root level^{^a}
Nerve Root Level Needle-Tip Location Mean Needle Angle for Needle-Tip Locations and Level (°) Mean Needle Angle for all Needle-Tip Locations (°) Contrast Distribution
Foraminal Zone Junctional Extra-Foraminal Foraminal Zone Junctional Extra-Foraminal Mean SD Intra-Foraminal Extra-Foraminal Central Epidural Other
C4 1 3 1 32 50 23 41.1 16.4 4 5 2 0
C5 8 11 3 31 49 58 43.8 17.8 20 22 4 0
C6 17 13 16 28 39 33 32.7 19.1 34 42 6 3
C7 3 7 2 19 31 33 28.1 15.5 11 11 0 0
C8 1 2 2 18 6 5 7.6 22.6 3 3 0 0
Total (%) 30 (34) 36 (39) 24 (27) 72 (80) 83 (92) 12 (13) 3 (3)
↵a Contrast distribution could be seen in >1 site for each injection.

Nerve Root Level	Needle-Tip Location			Mean Needle Angle for Needle-Tip Locations and Level (°)			Mean Needle Angle for all Needle-Tip Locations (°)		Contrast Distribution
Nerve Root Level	Foraminal Zone	Junctional	Extra-Foraminal	Foraminal Zone	Junctional	Extra-Foraminal	Mean	SD	Intra-Foraminal	Extra-Foraminal	Central Epidural	Other
C4	1	3	1	32	50	23	41.1	16.4	4	5	2	0
C5	8	11	3	31	49	58	43.8	17.8	20	22	4	0
C6	17	13	16	28	39	33	32.7	19.1	34	42	6	3
C7	3	7	2	19	31	33	28.1	15.5	11	11	0	0
C8	1	2	2	18	6	5	7.6	22.6	3	3	0	0
Total (%)	30 (34)	36 (39)	24 (27)						72 (80)	83 (92)	12 (13)	3 (3)