Naomi is creating a new depression questionnaire

Naomi is creating a new depression questionnaire. In drafting…

 

Naomi is creating a new depression questionnaire. In drafting items, she makes sure that her item content reflects symptoms like depressed mood and loss of energy.

To understand research participants and clients better, she also includes some items assessing agoraphobia. What impact does the addition of agoraphobia items have on the questionnaire’s properties?

 

A) It improves the internal consistency of the questionnaire.

B) It reduces the validity of the questionnaire.

C) It enhances the validity of the questionnaire.

D) It reduces the test re-test reliability of the questionnaire.

What is a questionnaire for screening the severity of depression?
The Patient Health Questionnaire (PHQ)-9 is the major depressive disorder (MDD) module of the full PHQ. Used to provisionally diagnose depression and grade severity of symptoms in general medical and mental health settings.