At 9 items, the PHQ depression scale (which
we call the PHQ-9) is half the length of many
other depression measures, has comparable sensitivity
and specificity, and consists of the actual
nine criteria on which the diagnosis of DSM-IV
depressive disorders is based.9 The latter feature
distinguishes the PHQ-9 from other two-step
depression measures for which, when scores are
high, additional questions must be asked to
establish DSM-IV depressive diagnoses. The
PHQ-9 is thus a dual-purpose instrument that,
with the same nine items, can establish provisional
depressive disorder diagnoses as well as
grade depressive symptom severity
At 9 items, the PHQ depression scale (whichwe call the PHQ-9) is half the length of manyother depression measures, has comparable sensitivityand specificity, and consists of the actualnine criteria on which the diagnosis of DSM-IVdepressive disorders is based.9 The latter featuredistinguishes the PHQ-9 from other two-stepdepression measures for which, when scores arehigh, additional questions must be asked toestablish DSM-IV depressive diagnoses. ThePHQ-9 is thus a dual-purpose instrument that,with the same nine items, can establish provisionaldepressive disorder diagnoses as well asgrade depressive symptom severity
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