The International Anxiety Questionnaire (IAQ)

A Self-Report Measure of ICD-11 Generalized Anxiety Disorder

The International Anxiety Questionnaire (IAQ) is a self-report measure of ICD-11 Generalised Anxiety Disorder (ICD-11 diagnostic code 6B00). It can be used to generate severity scores and to identify cases meeting diagnostic criteria. The severity scoring method simply involves summing the scores of the 8 IAQ items producing a possible range of scores from 0 to 32. No cut-off scores are proposed, as ‘caseness’ is defined by applying the ICD-11 diagnostic algorithm. The IAQ is freely available in the public domain to all interested parties. The development and initial validation study can be found by clicking here​.

A copy of the IAQ can be freely downloaded by clicking on the version below. The document includes a description of the scale, the key publications, and the scoring instructions. Translations are in process. If you wish to contribute a translation, please contact Prof. Mark Shevlin by email at m.shevlin@ulster.ac.uk 

International Anxiety Questionnaire_English