..  documentation/source/tasks/phq9.rst

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.. _phq9:

Patient Health Questionnaire-9 (PHQ-9)
--------------------------------------

.. include:: include_from_lp_specific.rst

History and guide
~~~~~~~~~~~~~~~~~

See Spitzer et al. (1999) (http://www.ncbi.nlm.nih.gov/pubmed/10568646) and the
instructions (http://www.phqscreeners.com/instructions/instructions.pdf).

A score of ≥10 identifies major depressive disorder (MDD) with sensitivity
77-88%, specificity 88-94% (Kroenke et al. 2010,
http://www.ncbi.nlm.nih.gov/pubmed/20633738).

Source
~~~~~~

Original source is at http://www.phqscreeners.com.

Intellectual property rights
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Public domain.

- “All PHQ, GAD-7 screeners and translations are downloadable from this website
  and no permission is required to reproduce, translate, display or distribute
  them. Relevant articles and a bibliography are also freely available.”
  (http://www.phqscreeners.com/overview.aspx, accessed 2012-09-04.)

- “All of the measures included in Table 1 are in the public domain. No
  permission is required to reproduce, translate, display or distribute.”
  (http://www.phqscreeners.com/instructions/instructions.pdf, accessed
  2012-09-04.)

- Newman & Feldman (2011) NEJM 365:2247,
  http://www.nejm.org/doi/full/10.1056/NEJMp1110652
