Table 1 Socio-demographic characteristics of study participants.

	MDD (N = 201)	HC (N = 104)	p value
Age (SD)	35.26 (12.62)	33.10 (10.73)	0.12^a
Sex (%Female)	125 (62.2%)	66 (63.5%)	0.83^b
MADRS (SD)	29.89 (5.46)	0.85 (1.72)	<0.001^a
Ethnicity	146 (69.5%)	71 (68.2%)	0.43^b
Caucasian	32 (15.9%)	23 (22.1%)	0.18^b
Asian	13 (6.5%)	3 (2.9%)	0.18^b
Hispanic	10 (5%)	2 (1.9%)	0.19^b
Black	16 (8%)	4 (3.8%)	0.16^b
Others	−	2
No answer
Duration of current episode-months (SD)	25.79 (33.61)	−

HC healthy control, MADRS Montgomery Asberg Depression Rating Scale, MDD Major Depressive Disorder, N = number, SD standard deviation.
^at test.
^bChi-2.

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