11 multi-part questions – the Patient Health Questionnaire was developed and validated. Though less commonly used, there are also brief versions of the PHQ-9 and GAD-geriatric anxiety inventory pdf that may be useful as screening tools in some settings.
The PHQ is available in over 20 languages, available on the PHQ website. Additionally, the measures have been validated in a number of different populations internationally. Some modules are used independently, and variants have been developed based on the original items. This tool is used in a variety of different contexts, including clinical settings across the United States as well as research studies.
This version of the PHQ has been shown to have good diagnostic sensitivity but poor specificity. It is a well-validated measure, which asks whether symptoms are present and about their severity. The development of the PHQ-15 helped address three main problems in the assessment and diagnosis of somatoform disorders. Secondly, in order to attain more reliable and valid data, asseessments need to address more current rather than previous symptoms. The GAD-7 is a 7-item scale designed to assess symptoms of anxiety. Cut points of 5, 10, and 15 correspond to mild, moderate, and severe anxiety.