Table 3.
The repeated measure and MANOVA tests comparing the CNV parameters (mean ± SE) between channels and groups consecutively
| CNV parameters | Control | LBP | F value; groups comparison |
|---|---|---|---|
| Late CNV (Fz) | 6.7 ± 0.86 | 14.14 ± 0.86 | 37.36*** |
| Late CNV (Cz) | 9.02 ± 0.73 | 16.67 ± 0.73 | 54.17*** |
| Late CNV (Pz) | 7.35 ± 0.9 | 15.41 ± 0.9 | 39.95*** |
|
F value; Channels comparison |
4.35* | 1.74 | |
| Peak CNV (Fz) | 7.60 ± 0.84 | 15.49 ± 0.84 | 43.82*** |
| Peak CNV (Cz) | 9.86 ± 0.75 | 18.02 ± 0.75 | 58.67*** |
| Peak CNV (Pz) | 8.10 ± 0.88 | 16.27 ± 0.88 | 42.66*** |
|
F value; Channels comparison |
4.30* | 1.79 | |
| CNV area (Fz) | 0.018 ± 0.006 | 0.047 ± 0.006 | 13.22** |
| CNV area (Cz) | 0.022 ± 0.007 | 0.055 ± 0.007 | 11.44** |
| CNV area (Pz) | 0.018 ± 0.007 | 0.046 ± 0.007 | 8.89** |
|
F value; Channels comparison |
1.68 | 1.56 |
Frontal (Fz), Central (Cz), and Parietal (Pz) midline channels. CNV contingent negative variation, LBP low back pain
Significant values (P value < 0.05) are presented by asterisks
* P < 0.05; ** P < 0.01; *** P < 0.001