Table I. Demographic and clinical details of recruited subjects.

	Training set			Test set
	HC	MDD	Pa	HC	MDD	Pa
Sample size	82	82	–	52	44	–
Medication (Y/N)	N	N	–	N	13/31	–
Sex (M/F)	53/29	46/36	0.26	27/25	17/27	0.19
Age (years)b	34.2 ± 10.1	32.2 ± 10.3	0.20	28.8 ± 9.8	34.1 ± 9.1	0.01
BMIb	20.9 ± 2.6	21.6 ± 2.7	0.15	21.3 ± 2.4	22.1 ± 3.1	0.14
HDRS scoresb	0.2 ± 0.6	22.4 ± 4.6	0.00	0.3 ± 0.7	25.7 ± 3.9	0.00

HC, healthy control; MDD, major depressive disorder; Y/N, yes/no; M/F, male/female; BMI, body mass index; HDRS, Hamilton Depression Rating Scale.

Chi-square analyses for categorical variables (sex).

^a Two-tailed Student's t test for continuous variables (age, BMI, and HDRS scores).

^b Values expressed as the mean ± S.D.