Intervention Related Factors
								95%CI
Variables	n	τ2	Adj. R2	β	SE	t	p	LB	UP
Presence of tDCS with a combined intervention ‡
Total number of intervention sessions	26	1.45	24.40	0.09	0.03	2.97	0.007†	0.03	0.15
# of Intervention sessions above/below 8 (median)	26	2.01	4.60	0.56	0.64	0.87	0.39	−0.77	1.89
Frequency of intervention sessions per week	26	2.04	6.30	0.09	0.17	0.52	0.61	−0.27	0.45
Duration of tDCS intervention (in weeks)	26	1.32	31.30	0.28	0.09	2.96	0.007*	0.08	0.47
Patient setting (inpatient/ outpatient/ home)	26	1.69	12.09	−1.99	0.96	−2.06	0.05	−3.98	0.00
Active electrode location	26	2.03	5.91	0.08	0.34	0.23	0.82	−0.63	0.79
Use of a combined intervention with tDCS	26	2.00	4.19	0.46	0.98	0.47	0.64	−1.57	2.49
tDCS duration of session (in minutes)	26	1.34	30.11	0.55	0.18	3.08	0.005†	0.18	0.92

^†Not significant after influential point adjustment;

^*Statistically significant at 0.01 level;

^‡Calculation not possible due to low number of observations