The effect of bilateral tDCS over dorsolateral prefrontal cortex on the cognitive abilities of men with opioid use disorder under methadone therapy: A sham-controlled clinical trial

Table 2 Mean and standard deviation (SD) of COQ scores before and after intervention

Cognitive abilities		Group A (n = 10), mean ± SD	Improvement rate (%)	Group B (n = 11), mean ± SD	Improvement rate (%)	Group C (n = 10), mean ± SD	Improvement rate (%)
Cognitive flexibility	Posttest	14.60 ± 2.31	39	14.81 ± 2.63	31	13.80 ± 4.07	10
Cognitive flexibility	Pretest	10.50 ± 2.71	39	11.27 ± 2.68	31	15.40 ± 3.33	10
Social cognition	Posttest	7.90 ± 2.64	6	7.09 ± 2.50	13	7.30 ± 3.26	3
Social cognition	Pretest	8.40 ± 2.98	6	8.18 ± 2.60	13	7.10 ± 3.44	3
Inhibitory control/selective attention	Posttest	22.70 ± 4.76	41	20.27 ± 4.47	30	20 ± 5.14	6
Inhibitory control/selective attention	Pretest	16.10 ± 6.04	41	15.54 ± 4.22	30	21.30 ± 4.69	6
Decision Making	Posttest	17.80 ± 4.7	60	17.72 ± 4.83	45	18.50 ± 3.43	5
Decision Making	Pretest	11.2 ± 3.08	60	12.2 ± 4.24	45	17.60 ± 4.35	5
Sustained attention	Posttest	10 ± 2.49	33	11.09 ± 2.54	47	10.60 ± 3.06	4
Sustained attention	Pretest	7.50 ± 3.50	33	7.54 ± 2.91	47	10.20 ± 3.52	4
Planning	Posttest	11.20 ± 2.57	49	10.63 ± 2.37	48	10.70 ± 2.86	2
Planning	Pretest	7.50 ± 2.71	49	7.18 ± 1.72	48	10.9 ± 2.13	2
Memory	Posttest	17.60 ± 5.66	51	20.45 ± 3.38	48	18.20 ± 7	3
Memory	Pretest	11.60 ± 5.16	51	13.81 ± 5.68	48	18.80 ± 6.95	3