Personality disorders in older adults: expert opinion as a first step toward evaluating the criterion validity of an informant questionnaire (HAP)
There is a lack of validated questionnaires for screening personality disorders (PDs) in older adults (e.g. Van Alphen et al., 2012). The development of measurement instruments is hampered because the criteria of DSM-IV-TR PD are not age-neutral that might lead to over- and underdiagnosis (Balsis et al., 2007). As far as we know only three measurement instruments have been specifically developed for older adults, including the Hetero- Anamnestic Personality questionnaire (HAP; Barendse et al., 2013). However, we did not find any articles concerning the criterion validity of all ten PDs in an elderly population. In this Delphi study, a panel of experts examined two research questions: (1) To what extend are the items of the HAP age-neutral? (2) Does the HAP detect all ten specific PD's of DSM-IV-TR, based on qualitative research?