Table 1.

Demographic information of the participants including means and standard deviations

Variable	Participant (n = 66)	LD group (n = 28)	RD group (n = 28)	p value
Sex				0.001
Male	15 (22.7)	11 (39.3)	1 (30.6)
Female	51 (77.3)	17 (60.7)	27 (960.4)
Age (yr)	44.77 ± 13.62	46.39 ± 11.54	40.86 ± 15.65	0.139
Education (yr)	12.77 ± 6.41	13.93 ± 9.05	11.78 ± 3.47	0.255
Past suicide attempt				0.406
Yes	24 (36.4)	8 (28.6)	11 (39.3)
No	42 (63.6)	20 (71.4)	17 (60.7)
CFI	81.36 ± 19.04	82.68 ± 16.27	80.25 ± 20.31	0.623
RRQS	70.73 ± 12.34	71.11 ± 11.10	76.86 ± 15.40	0.842
RRQT	75.94 ± 12.80	75.07 ± 11.45	70.39 ± 15.19	0.624
BDI-II	22.21 ± 15.30	19.64 ± 13.40	23.39 ± 16.43	0.354
HAM-D	14.65 ± 6.80	13.43 ± 7.13	15.57 ± 5.92	0.228
BAI	41.20 ± 13.92	39.29 ± 12.77	41.96 ± 14.70	0.469
SBQ-R	8.97 ± 4.75	8.21 ± 4.43	9.54 ± 4.83	0.290
Alpha asymmetry index of FP1–FP2
Low alpha band	0.91 ± 7.68	3.17 ± 5.01	−0.81 ± 8.55	0.038
High alpha band	0.48 ± 6.32	2.13 ± 3.30	−0.33 ± 7.92	0.134
Alpha band	0.63 ± 6.57	2.52 ± 3.57	−0.56 ± 7.89	0.068
Alpha asymmetry index of F3–F4
Low alpha band	2.47 ± 5.98	5.59 ± 4.58	−0.33 ± 5.63	< 0.001
High alpha band	1.54 ± 4.83	3.52 ± 4.22	0.02 ± 5.04	0.007
Alpha band	1.91 ± 4.66	4.32 ± 3.51	−0.02 ± 4.74	< 0.001
Alpha asymmetry index of F7–F8
Low alpha band	4.96 ± 9.29	12.27 ± 6.95	−2.68 ± 6.17	< 0.001
High alpha band	3.88 ± 6.98	9.56 ± 3.76	−2.01 ± 5.37	< 0.001
Alpha band	4.33 ± 7.40	10.64 ± 4.24	−2.19 ± 5.25	< 0.001

Values are presented as number (%) or mean ± standard deviation.

LD group, left-dominant group; RD group, right-dominant group; CFI, Cognitive Flexibility Inventory; RRQS, Rumination Reflection Questionnaire-State; RRQT, Rumination Reflection Questionnaire-Trait; BDI-II, Beck Depression Inventory II; HAM-D, Hamilton Rating Scale for Depression; BAI, Beck Anxiety Inventory; SBQ-R, Suicidal Behavior Questionnaire-Revised.

Alpha asymmetry was measured at three frontal regions (i.e., FP1–FP2, F3–F4, F7–F8) for the low alpha band, the high alpha band, and the alpha band.