Preparatory brain activity and anticipatory postural adjustments accompanied by externally cued weighted-rapid arm rise task in non-specific chronic low back pain patients and healthy subjects

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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