Comparison of image noise by vertebral level
| Image Noise | Control Group | Intervention Group | P Valuea |
|---|---|---|---|
| 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.