Depression severity was assessed during the intake interview with the Beck Depression Inventory II (Beck, Steer, & Brown, 1996) and the 17-item Hamilton Rating Scale for Depression (HRSD; Hamilton, 1960). The intra-class correlation of inter-rater agreement was .95 for a randomly selected sample of 10% of HRSD interviews in the present sample. Because epidemiological studies have indicated an inverse relation between social class and rates of unipolar depression (e.g., Leventhal & Brooks-Gunn, 2000), and because SES has been linked to frontal EEG asymmetry (Tomarken, Dichter, Garber & Simien, 2004), socioeconomic status (SES) was assessed using the Four Factor Index of Social Status (Hollingshead, 1975).
