Table 1.

General demographic data of each group.

Items	MDD (n = 27)	First-degree relatives (n = 16)	HC (n = 28)	F/χ2	P
Sex (female/male)	19/8	11/5	17/11	0.306	0.738
Age	28.92 ± 8.72	30.93 ± 4.15	26.78 ± 6.91	1.643	0.201
Education (year)	13.77 ± 2.48	13.56 ± 2.12	14.85 ± 2.42	2.038	0.138
HAMD-24	26.92 ± 4.15	4.56 ± 1.71	5.39 ± 1.68	475.877	<0.01