Major depression was diagnosed on the basis ofstandard criteria
contained in the Diagnostic and Statistical Manual of Mental
Disorders, 4th edition (DSM-IV). Clinically significant minor
depression was defined by DSM-IV criteria for minor depression
modified by requiring four depressive symptoms, Hamilton
depression rating scale score of 10 or more, and duration of at
least four weeks. We did a structured clinical interview for axis
I DSM-IV disorders (SCID) assessment of all participants.