Two-year retest reliability and predictive validity of the Self- and Informant-Personality Inventory for ICD-11 in older adults.

The adopted a fully dimensional model of personality disorder. The Personality Inventory for (PiCD) and Informant-Personality Inventory for (IPiC) were developed to assess the trait model, and the PiCD has since received significant validation support. However, there has only been one prior study of longitudinal predictive validity of the PiCD, two relatively short test-retest reliability studies of the PiCD, and no prior longitudinal tests of the IPiC.