GAD-2
The GAD-2 (Generalized Anxiety Disorder) is a short and efficient screening instrument for the detection of generalized anxiety disorders , which emerged from the GAD-7 and has established itself as an independent questionnaire from the patient health questionnaire (PHQ-D) . In addition, it is also suitable for recording other anxiety disorders. He uses two questions to ask specific complaints within the last two weeks, which are answered on a four-point scale. Possible answers are “not at all”, “on a few days”, “on more than half of the days” and “almost every day”, to which the numerical values 0 to 3 are assigned accordingly.
Evaluation of the GAD-2
A scale value in the range of 0–6 points is calculated from the summation of both items. Higher scores correspond to higher loads. A value in the test of ≥ 3 ( cut-off value ) is to be assessed as a serious indicator of pathological anxiety manifestations.
Test diagnostic quality criteria of GAD-2
Criterion validity
The GAD-2 has the following sensitivities with a cut-off value of ≥ 3:
- 86% for generalized anxiety disorders,
- 76% for panic disorder
- 70% for social anxiety disorders as well
- 59% for post-traumatic stress disorder.
The following specificities with a cut-off value of ≥ 3 are reported:
- 83% for generalized anxiety disorders,
- 81% for panic disorder
- 81% for social anxiety disorders
- 81% for post-traumatic stress disorder.
Reliability
According to Cronbach's alpha, the internal consistency is α = .82.
Comparative values
In a study with a sample of 2149 patients, the mean GAD-2 was 1.4 (SD = 1.7).
See also
Individual evidence
- ^ RL Spitzer, K. Kroenke, JW Williams, B. Löwe: A brief measure for assessing generalized anxiety disorder: the GAD-7. In: Arch Intern Med . 166, 2006, pp. 1092-1097.
- ↑ a b c d e f K. Kroenke, RL Spitzer, JB Williams, PO Monahan, B. Löwe: Anxiety disorders in primary care: prevalence, impairment, comorbidity, and detection. In: Ann Intern Med. 146, 2007, pp. 317-325.
