Patient health questionnaire-15 (PHQ-15) to distinguish bipolar II disorder from major depressive disorder.

A sequential-recruited clinical trial has been conducted to assess capacity of Patient Health Questionnaire-15 (PHQ-15) in distinguishing bipolar II disorder from major depressive disorder. A total of 73 patients (49 BD-II depression patients) filled sociodemographic characteristics, Patient Health Questionnaire-9 (PHQ-9), Generalized Anxiety Disorder-7 Questionnaire (GAD-7), and PHQ-15. Sum score of PHQ-15 showed statistically significant difference in the two groups (t-test, P = 0.027). The area under the curve was 0.663 (P = 0.025), and the specificity was 0.75 at sum score of 13. Patients with BD-II depression has more somatic symptoms than MDD, and PHQ-15 might be used for identification.