Table 2 –

Zero order bivariate correlations between EEG gel volume and data quality metrics calculated for the baseline recording

	DC Offset
	Fz	FCz	Cz	Pz	Oz	Front	Central	Temp	Par	Occ
Gel Vol	0.25***	0.34***	0.16*	0.28***	0.38***	0.40***	0.34***	0.36***	0.34***	0.30***
M (SD)	6.50 (5.58)	5.77 (5.48)	6.06 (5.30)	6.93 (6.66)	6.81 (5.81)	6.41 (5.53)	5.24 (5.06)	6.69 (5.87)	5.42 (5.31)	6.78 (6.60)
	Signal-to-Noise Ratio
Gel Vol	0.04	−0.13†	0.18*	0.02	0.04	0.04	0.09	0.03	0.03	0.04
M (SD)	6.09 (8.88)	16.82 (9.65)	10.86 (8.05)	5.70 (9.17)	4.66 (8.88)	6.30 (7.97)	9.78 (8.14)	6.64 (8.84)	5.83 (8.50)	4.98 (8.82)

Note: Absolute value of offsets were computed prior conducting the correlation with gel volume to quantify distance from 0 without regard for directionality, and so that magnitude of offset would not be obscured in the averaging. Means and standard deviations reported are of the absolute values.

B = Baseline; C/Cent = Central; F/Front = Frontal; FC = Frontocentral; O/Occ = Occipital; Off = Offset; P/Par = Parietal; Temp = Temporal; Vol = Volume; z = Midline

^†p < 0.1,

^*p < 0.05,

^**p < 0.01,

^***p ≤ 0.001