..  docs/source/tasks/gad7.rst

..  Copyright (C) 2012, University of Cambridge, Department of Psychiatry.
    Created by Rudolf Cardinal (rnc1001@cam.ac.uk).
    .
    This file is part of CamCOPS.
    .
    CamCOPS is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    .
    CamCOPS is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU General Public License for more details.
    .
    You should have received a copy of the GNU General Public License
    along with CamCOPS. If not, see <http://www.gnu.org/licenses/>.

.. _gad7:

Generalized Anxiety Disorder Assessment (GAD-7)
-----------------------------------------------

.. include:: include_from_lp_specific.rst

.. include:: include_from_perinatal_common.rst


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

See Spitzer et al. (2006) (http://www.ncbi.nlm.nih.gov/pubmed/16717171) and the
instructions (http://www.phqscreeners.com/instructions/instructions.pdf).

A score of ≥10 identifies generalized anxiety disorder (GAD) with sensitivity
89%, specificity 82% (Spitzer et al. 2006,
http://www.ncbi.nlm.nih.gov/pubmed/16717171).

A score of ≥10 identifies panic disorder with sensitivity 74%, specificity 81%
(Kroenke et al. 2010, http://www.ncbi.nlm.nih.gov/pubmed/20633738).

A score of ≥10 identifies social anxiety with sensitivity 72%, specificity 80%
(Kroenke et al. 2010).

A score of ≥10 identifies post-traumatic stress disorder (PTSD) with
sensitivity 66%, specificity 81% (Kroenke et al. 2010).


Source
~~~~~~

Original source is at 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.)


Notes
-----

- CamCOPS does not suffer and has not suffered from the GAD-7 reproduction
  error noted by Zorowitz et al. (2021), *Lancet Psychiatry* 8: 180,
  https://pubmed.ncbi.nlm.nih.gov/33610220/,
  https://doi.org/10.1016/S2215-0366(21)00001-8.
  (The error, noted in a large number of publications, was to use “not at all
  sure” as the “zero” or lowest-value response, which is incorrect, rather than
  the correct option of “not at all”.) Checked on 2022-01-05.