Anxiety and Depression were measured using a subset of items from the SCL-90 (Derogatis et al., 1973), a measure used both in clinical practice and research to measure psychological symptoms. This self-report questionnaire utilized a past month timeframe, and consisted of 24 empirically derived items from four of the SCL subscales: depression (11 items), somatization (1 item), anxiety (7 items), and phobic anxiety (5 items). Response options were “not at all,” “a little bit,” “moderately,” “quite a bit,” and “extremely.” The anxiety (α = 0.85) and depression (α = 0.89) subscales used in these analyses were created by averaging the responses for those with non-missing answers for more than half of the anxiety and depression questions respectively.
