. 2016 Sep 21;7:1406. doi: 10.3389/fpsyg.2016.01406

Table 2.

Correlation matrix corresponding to the variables included in the model (Control group and ADHD group) and descriptive data (means, standard deviation, skewness and kurtosis).

	1	2	3	4	5	6	7	8	9	10
1	-	0.499^∗∗	0.594^∗∗	0.330^∗∗	0.306^∗∗	0.435^∗∗	0.514^∗∗	0.213^∗∗	0.213^∗∗	0.222^∗∗
2	0.441^∗∗	-	0.315^∗∗	0.743^∗∗	0.471^∗∗	0.258^∗∗	0.304^∗∗	0.366^∗	0.183^∗	0.218^∗∗
3	0.848^∗∗	0.303^∗∗	-	0.376^∗∗	0.238^∗∗	0.290^∗∗	0.330^∗∗	0.125	0.108	0.090
4	0.428^∗∗	0.842^∗∗	0.387^∗∗	-	0.447^∗∗	0.193^∗∗	0.203^∗∗	0.380^∗∗	0.122	0.159^∗
5	0.456^∗∗	0.757^∗∗	0.371^∗∗	0.795^∗∗	-	0.342^∗∗	0.449^∗∗	0.667^∗∗	0.389^∗∗	0.447^∗∗
6	0.720^∗∗	0.378^∗∗	0.660^∗∗	0.398^∗∗	0.453^∗∗	-	0.505^∗∗	0.132^∗	0.428^∗∗	0.358^∗∗
7	0.811^∗∗	0.309^∗∗	0.816^∗∗	0.356^∗∗	0.425^∗∗	0.722^∗∗	-	0.428^∗∗	0.380^∗∗	0.458^∗∗
8	0.411^∗∗	0.731^∗∗	0.339^∗∗	0.753^∗∗	0.852^∗∗	0.441^∗∗	0.409^∗∗	-	0.339^∗∗	0.479^∗∗
9	0.698^∗∗	0.475^∗∗	0.703^∗∗	0.559^∗∗	0.571^∗∗	0.678^∗∗	0.725^∗∗	0.525^∗∗	-	0.813^∗∗
10	0.644^∗∗	0.492^∗∗	0.670^∗∗	0.580^∗∗	0.631^∗∗	0.614^∗∗	0.750^∗∗	0.596^∗∗	0.874^∗∗	-
Control group
M	101.64	105.50	0.58	0.59	98.76	100.90	97.44	99.37	0.49	1.51
SD	12.40	17.45	0.07	0.07	8.01	10.09	8.65	10.45	1.05	2.29
Skewness	0.970	1.192	1.181	0.909	0.216	0.097	0.708	0.506	0.572	0.461
Kurtosis	0.926	1.158	4.314	1.331	-0.150	1.024	0.913	1.839	-0.089	-0.238
ADHD group
M	78.52	79.82	0.43	0.43	77.05	82.83	76.55	77.67	-1.49	-3.39
SD	10.71	12.04	0.07	0.07	10.82	10.82	10.13	10.06	0.89	1.89
Skewness	0.501	1.138	-0.070	-0.033	-0.017	-0.052	-0.058	0.528	-0.207	-0.548
Kurtosis	2.399	4.048	0.118	0.457	1.469	1.321	0.544	2.702	0.008	-0.097

In the correlation matrix, the upper matrix corresponds to the without ADHD sample and the lower matrix to the ADHD group sample. 1, nirHEG-Fp1; 2, nirHEG-FpZ; 3, Q-EEG-Fp1; 4, Q-EEG-CZ; 5, TOVA omissions; 6, TOVA commissions; 7, TOVA variability; 8, TOVA response time; 9, TOVA D prime; 10, TOVA ADHD index.

^∗p < 0.05; ^∗∗p < 0.001.