Table 1. Demographics, clinical and psychological variables.

	22 Non-MDD		31 MDD		Stats
	Mean	s.d.	Mean	s.d.	t/χ2	P
Demographic variables
Gender	11 F	11 M	15 F	16 M	0.03	0.86
Age (years)	26.8	8.7	27.6	7.8	0.35	0.72
Education (years)	15.2	1.3	14.7	1.8	1.0	0.30
Marital status
Married/living with partner	N=4		N=4		2.4	0.30
Single	N=18		N=24
Separated/divorced	N=0		N=3
Race
African American	N=2		N=3		0.84	0.36
Asian	N=5		N=7
Caucasian	N=10		N=13
Other	N=5		N=8
Clinical variables
Age of MDD onset			22	7
Number of previous episodes			2	1
Comorbid diagnosis
Posttraumatic stress disorder			N=3
Generalized anxiety disorder			N=2
Panic disorder			N=4
Social phobia			N=2
Psychological variables
Beck Depression Inventory-2	1.1	1.9	25.5	8.4	13.0	<0.01
Post-scanner ratingsa
Low pain anticipationb	1.5	0.4	1.6	0.3	0.19	0.8
High pain anticipation	4.3	0.7	4.4	0.6	0.14	0.9
Low pain intensityc	1.5	0.4	2.0	0.3	0.92	0.4
Low pain unpleasantnessc	1.3	0.4	1.6	0.3	0.55	0.6
High pain intensity	4.8	0.6	5.4	0.5	0.91	0.4
High pain unpleasantness	4.6	0.6	4.6	0.6	0.02	1.0

Abbreviations: F, females; M, males; MDD, major depressive disorder; Non-MDD, never-depressed controls.

^aMissing data in two MDD subjects.

^bScale range from 0 to 5.

^cScale range from 0 to 10 (see text for details).