Table 4.

Results of image evaluation using Likert scales (mean scores ± standard deviation [StDev]) for evaluations of reader 1 [R1] and reader 2 [R2].

	SD	LD	p value
Overall image quality
R1	1.60 ± 0.85	1.54 ± 0.74	0.46
R2	1.59 ± 0.80	1.53 ± 0.82	0.44
Kappa	0.83	0.86
Overall artifacts
R1	1.51 ± 0.87	1.38 ± 0.72	0.17
R2	1.46 ± 0.80	1.43 ± 0.79	0.65
Kappa	0.87	0.87
Image contrast
R1	1.30 ± 0.61	1.21 ± 0.49	0.22
R2	1.28 ± 0.49	1.42 ± 0.62	0.04
Kappa	0.73	0.62
Determination of nerve root
R1	1.13 ± 0.34	1.12 ± 0.35	0.99
R2	1.16 ± 0.37	1.10 ± 0.33	0.21
Kappa	0.72	0.83
Confidence for intervention planning
R1	1.13 ± 0.34	1.12 ± 0.35	0.99
R2	1.11 ± 0.31	1.10 ± 0.33	0.99
Kappa	0.72	0.83
Confidence for intervention procedure
R1	1.02 ± 0.14	1.02 ± 0.14	0.99
R2	1.03 ± 0.17	1.02 ± 0.14	0.99
Kappa	0.80	0.49