Major depression is associated with adverse outcomes in patients who have coronary heart disease. How best to identify depression in busy cardiology practices is unknown. We compared the test characteristics of 4 depression screening instruments with an interview diagnosis of depression (Diagnostic Interview Schedule) in 1,024 outpatients who had coronary heart disease. Screening instruments were the 10-item Center for Epidemiologic Studies Depression Scale-10, the Patient Health Questionnaire-9, the Patient Health Questionnaire-2, and a simple 2-item instrument that asks (1) "During the past month, have you often been bothered by feeling down, depressed, or hopeless?" and (2) "During the past month, have you often been bothered by little interest or pleasure in doing things?" Of the 1,024 participants, 224 (22%) had major depression based on the Diagnostic Interview Schedule. Areas under the receiver-operating characteristic curves were similar for all instruments (range 0.84 to 0.87). In conclusion, a positive response to 1 of the 2 items was 90% sensitive and 69% specific for depression, with a negative likelihood ratio of 0.14. Thus, negative responses to the 2 items effectively ruled out depression. A score ≥10 on the Patient Health Questionnaire-9 was 54% sensitive and 90% specific, with a positive likelihood ratio of 5.4. Thus, a cutpoint ≥10 was virtually diagnostic for depression.Major depression is a common condition in patients who have coronary heart disease (CHD), with a prevalence of 20% to 30%. 1,2 Depression is associated with poor health-related quality of life and adverse cardiovascular outcomes in patients who have CHD. 3,4 However, it is not known how best to detect depression in busy cardiology practices. We evaluated the test characteristics of 4 depression screening instruments compared with a diagnostic interview for depression in a sample of 1,024 adults who had stable CHD and were enrolled in the Heart and Soul Study.
Methods
Study participantsThe Heart and Soul Study is a prospective cohort study of psychosocial factors and health outcomes in patients who have CHD. Methods have been previously described. 3 In brief, administrative databases were used to identify outpatients who had documented coronary artery disease at 2 Department of Veterans Affairs medical centers (Veterans Affairs Medical Center, San Francisco and the Veterans Affairs Palo Alto Health Care System, Palo Alto, California), 1 university medical center (University of California, San Francisco), and 9 public health *Corresponding author: Tel: 415-750-2093; fax: 415-379-5573. mary.whooley@med.va.gov (M.A. Whooley A total of 15,438 eligible patients was mailed an invitation to participate, and 2,495 responded that they would be interested. Of the 2,495 patients, 505 could not be reached and 596 declined participation. An additional 370 patients were excluded because they had a history of myocardial infarction in the previous 6 months, deemed themselves unable to walk 1 block, or were planning to move out of the lo...