Table A1.

Factors of the 12-item Center for Epidemiologic Studies Depression (CES-D) Scale.

	Reversed
Negative affect/somatic symptoms
I had trouble keeping my mind on what I was doing	−
I felt depressed	−
I felt that everything I did was an effort	−
My sleep was restless	−
I had crying spells	−
I could not get “going”	−
Positive affect
I felt hopeful about the future	+
I felt that I was just as good as other people	+
I was happy	+
I enjoyed life	+
Interpersonal problems
People were unfriendly	−
I felt that people disliked me	−

CES-D, Center for Epidemiologic Studies Depression Scale.