Table 1. Demographic data of subjects.

Characteristics	Patients (n = 69)	Controls (n = 78)	P values
Gender (male/female)	32/37	32/46	0.514
Age (year olds)	40.5±9.7 (20–60)	37.2±9.8 (20–59)	0.098
Smoking status (current/non-smoker)	20/49	19/59	0.526
Premorbid IQ	105.6±9.4 (85–120)	104.0±8.2 (87–118)	0.308
Education (years)	13.8±2.2 (9–18)	14.0±2.0 (12–18)	0.589
Body mass index	22.7±4.3 (15.0–35.9)	22.0±3.3 (17.1–34.3)	0.156
WHOQOL-BREF score	2.63±0.54 (1.27–3.69)	3.78±0.38 (1.96–2.88)	<0.001*
SASS score	26.5±8.3 (8–44)	41.7±5.4 (29–56)	<0.001*
CogState composite score	−0.46±0.80 (−2.85–1.02)	0.00±0.352 (−0.85–0.83)	<0.001+
Age of first depressive episode	33.0±10.0 (11–55)
Duration of illness (years)	7.2±7.3 (0–29)
Duration of untreated illness (years)	1.0±1.7 (0–9)
SIGH-D score	11.8±5.5 (0–24)

Data show the mean ± SD. Figures in parenthesis represent the range.

WHOQOL-BREF: World Health Organization Quality of Life-Short Version.

SASS: Social Adaptation Self-evaluation Scale, SIGH-D: 17 items of the Structured Interview Guide for the Hamilton Depression Rating Scale.

^*Student's t-test, ⁺Mann-Whitney's U-test.