Abnormalities of electroencephalography microstates in patients with depression and their association with cognitive function

Table 1 Demographic and clinical characteristics of depression group and healthy control

Variables	DEP (n = 24)	CON (n = 32)	χ2/t/W	P value
Gender (female/male)	8/16	15/17	0.555	0.4561
Age (yr)	32.4 ± 11.3	33.8 ± 10.5	0.490	0.6261
Education (years of schooling)a	13.3 ± 2.8	14.8 ± 2.7	2.056	0.0452
HAMD scorec	10 (0-23)	0 (0-6)	83	< 0.0013
Duration of illness (mo)	48.0 (24.5-195.0)
Age at onset (yr)	25.5 (16.8- 27.3)

¹Indicates P-value for Chi-square test.

²Indicates P-value for independent sample t-test.

³Indicates P-value for Wilcox Mann–Whitney test.

^aP < 0.05.

^cP < 0.001.

mean ± SD are reported for age, education; Median (interquartile range) are reported duration of illness, age at onset, HAMD score. DEP: Depression group; CON: Healthy control group; HAMD: Hamilton Depression Scale.