Table 1. Characteristics of patients with TRD or TSD and HS.

Variables(Mean±SD)	TRD	TSD	HS	P value
N (M/F)	23(11/12)	22(12/10)	19(10/9)	0.898a
Age, years	27.35±7.26	28.09±9.91	24.37±4.18	0.269b
Education, years	13.13±3.44	12.23±2.62	13.11±2.47	0.510b
Mean displacement (mm)	0.09±0.04	0.09±0.03	0.10±0.04	0.468b
Overall illness duration, months	27.43±35.89	2.95±1.73		0.004c
Current illness duration, months	12.22±6.08	2.95±1.73		<0.001c
HRSD score	24.52±4.17	25.89±6.26		0.407c
Factors of HRSD
1 Anxiety	6.96±1.89	7.78±2.16		0.202c
2 Weight loss	0.57±0.90	0.94±0.94		0.195c
3 Cognitive disturbance	5.39±1.70	6.28±1.93		0.127c
4 Retardation	7.96±1.52	7.67±1.94		0.595c
5 Sleep disturbance	3.65±2.01	3.17±1.47		0.395c

^aThe P value for gender distribution in the three groups was obtained by chi-square test.

^bThe P values were obtained by one-way analysis of variance tests.

^cThe P values were obtained by two sample t-test.

TRD = treatment-resistant depression.

TSD = treatment-sensitive depression.

HS = healthy subjects.

HRSD = Hamilton Rating Scale for Depression.