Table 5.

Correlation coefficients between dry and wet electrodes when measuring sinusoidal signals at different frequencies. Mean ± standard deviation.

Sample ID	Input frequency (Hz)
	1	10	15	20	40
Sample 1	0.968 ± 0.003	0.955 ± 0.035	0.981 ± 0.003	0.982 ± 0.004	0.982 ± 0.003
Sample 2	0.954 ± 0.002	0.982 ± 0.004	0.988 ± 0.001	0.980 ± 0.010	0.988 ± 0.001
Sample 3	0.931 ± 0.011	0.862 ± 0.027	0.903 ± 0.011	0.923 ± 0.030	0.899 ± 0.086
Sample 4	0.924 ± 0.039	0.898 ± 0.032	0.926 ± 0.010	0.933 ± 0.019	0.931 ± 0.016
Sample 5	0.983 ± 0.002	0.981 ± 0.007	0.983 ± 0.003	0.989 ± 0.002	0.992 ± 0.001
Drytrode	0.989 ± 0.001	0.997 ± 0.000	0.992 ± 0.001	0.996 ± 0.000	0.995 ± 0.000