Warnings and tips regarding patient rated scales/questionnaires

Let’s first look at the PHQ-9, a commonly used patient-rated scale, which we can use as an example to illustrate my warnings and tips. Patient Health Questionnaire (PHQ-9) This scale has 9 items corresponding to the 9 symptoms in the DSM-5-TR® diagnostic criteria for a major depressive episode. Each of the 9 symptoms is scored…