Messeplatz, Basel, Switzerland

Behavioural Dysfunction Questionnaire (BDQ)


The BDQ is a 50-item other-report questionnaire comprising five behavioural disorders, which are typical for the behavioural variant frontotemporal dementia (bvFTD). The questionnaire is based on the diagnostic criteria of Rascovsky et al. (2011)1. The 50 items of the questionnaire are distributed across the five behavioural disorders as follows:

  • Behavioural disinhibition (18 items)
  • Apathy (4 items)
  • Loss of empathy (8 items)
  • Perseverative, stereotyped, or compulsive behaviour (16 items)
  • Hyperorality/dietary changes (4 items)


Each item is rated from “none” to “very often or very severe”.

The following scores can be calculated:

  • Domain scores are mean scores of the items of each behavioural disorder
  • The total score is the mean score of all domain scores


Paper-pencil format

Administration time

5-10 minutes


German, English, French, Italian, Spanish

More information about the BDQ can be found in Literature

  1. Rascovsky, K., Hodges, J. R., Knopman, D., … Miller, B. L. (2011). Sensitivity of revised diagnostic criteria for the behavioural variant of frontotemporal dementia. Brain : a journal of neurology, 134(Pt 9), 2456–2477.


With the following links, you can download the BDQ versions in different languages, the scoring and interpretation sheet (includes norm values for the BDQ scores as well as cut-off scores between bvFTD and Alzheimer's disease dementia, respectively between bvFTD and at least moderate depressive episode) as also the calculation sheet for the scores:

file Normative data and cut-off scores file Calculation sheet file BDQ German version file BDQ English version file BDQ French version file BDQ Italian version file BDQ Spanish version