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Table 2: Comparison of image noise by vertebral level
Image Noise Control Group Intervention Group P Value^{^a}
At C4 
    Mean 26.8 ± 6.2 25.4 ± 7.1 
    Median 27.9 26.5 .60
    Range 14.4–37.8 5.7–34.3 
At C7 
    Mean 30.2 ± 10.7 27.7 ± 8.3 
    Median 29.9 26.4 .49
    Range 13.8–58.3 15.9–48.9 
At T1 
    Mean 39.0 ± 9.8 34.7 ± 14.9 
    Median 37.6 32.6 .11
    Range 24.1–66.4 7.3–70.1 
↵a Based on the 2-sample Wilcoxon test.

Image Noise	Control Group	Intervention Group	P Value^{^a}
At C4
Mean	26.8 ± 6.2	25.4 ± 7.1
Median	27.9	26.5	.60
Range	14.4–37.8	5.7–34.3
At C7
Mean	30.2 ± 10.7	27.7 ± 8.3
Median	29.9	26.4	.49
Range	13.8–58.3	15.9–48.9
At T1
Mean	39.0 ± 9.8	34.7 ± 14.9
Median	37.6	32.6	.11
Range	24.1–66.4	7.3–70.1