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The PHQ-15: Validity of a New Measure for Evaluating the Severity of Somatic Symptoms

From the Regenstrief Institute for Health Care and Department of Medicine (K.K.), Indiana University, Indianapolis, IN; and the New York State Psychiatric Institute and Department of Psychiatry (R.L.S., J.B.W.), Columbia University, New York, NY.

View larger version (52K): [in a new window]   Fig. 1. Relationship between somatic symptom severity as measured by the PHQ-15 and decline in functional status as measured by the six subscales of the SF-20. The decrement in SF-20 scores are shown as the difference between each PHQ-15 severity group and the reference group (ie, those with PHQ-15 scores of 0–4). SF-20 scores are adjusted for age, sex, education, and number of physical disorders. Effect size is the difference in adjusted means divided by the pooled standard deviation for that scale.