Peters et al. Delusions Inventory.

PDI

What it measures

Multidimensional delusional ideation in the general population: number of delusion-like beliefs endorsed plus, per belief, distress, preoccupation and conviction dimensions

Length and format

40 (PDI-40); 21 (PDI-21 short form). yes/no belief endorsement + three 5-point dimension ratings (distress, preoccupation, conviction) per endorsed item (self-report questionnaire)

Language versions

Many incl. DE (PDI-G), ES, FR, ZH, FA (Persian PDI-40), NL and others; widely translated

Normative data

No normative data held in our reference library for this instrument. That is a statement about our library, not about the published literature.

Licence

open with attribution

Licence classification is a research judgement by the catalogue’s authors, not legal advice, and it can be out of date. Confirm terms with the copyright holder or publisher before using an instrument, especially for commercial use.

Reference

Peters, E.R., Joseph, S., Day, S., & Garety, P. (2004). Measuring delusional ideation: the 21-item Peters et al. Delusions Inventory (PDI). Schizophrenia Bulletin, 30(4), 1005-1022.