Table 5. Pre- and postscores and p-values of the executive function assessments per group.

Central executive	tDCS	pre	p (real vs sham)	post	p (pre vs post)
Inhibition & Shifting
Stroop Card III	real	47.94 ± 33.90	0.327	64.63 ± 26.67	0.118
	sham	73.57 ± 25.45		77.43 ± 23.44	0.951
WCST	real	2.25 ± 1.49	0.323	3.00 ± 1.20	0.042 *
	sham	3.29 ± 0.76		3.43 ± 0.79	0.948
TMT B #	real	72.25 ± 30.84	0.947	80.63 ± 15.26	0.546
	sham	65.86 ± 25.12		76.14 ± 15.73	0.433
Updating & Control
TMT A	real	52.88 ± 39.08	0.925	70.88 ± 22.77	0.066
	sham	61.86 ± 24.95		75.71 ± 20.61	0.238
Stroop Card I	real	41.00 ± 35.29	0.689	67.75 ± 26.89	0.105
	sham	59.43 ± 29.71		62.14 ± 35.62	0.995
Stroop Card II #	real	49.38 ± 37.65	0.585	55.13 ± 30.77	0.935
	sham	71.29 ± 31.42		69.86 ± 30.43	0.999
D2 G z	real	39.81 ± 31.52	0.771	63.64 ± 23.82	0.074
	sham	54.00 ± 30.36		63.57 ± 27.42	0.741
D2 G z – F	real	45.26 ± 33.96	0.596	72.33 ± 20.48	0.059
	sham	62.86 ± 27.30		71.86 ± 22.87	0.812
D2 F%	real	83.13 ± 13.70	0.952	75.00 ± 24.20	0.699
	sham	87.29 ± 9.25		93.29 ± 5.65	0.872

* : p≤0.05

** : p≤0.01

Legend: tDCS = transcranial Direct Current Stimulation; TMT = Trail Making Test; WCST = Wisconsin Card Sorting Test; ^# = assumptions of the linear mixed model are violated.