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Yet, the classification of PDs is undergoing a critical transition phase with a paradigm shift to a dimensional approach for diagnosing PDs. No special attention was given to the expression of PDs in older age when the dimensional ICD\u201011 model was developed. Given that PDs are highly prevalent in older adults, there is an urgent need to examine if ICD\u201011 related instruments are able to adequately assess for PDs in older adults.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The age\u2010neutrality of ICD\u201011 measures was examined in a sample of 208 Dutch community\u2010dwelling adults (<jats:italic>N<\/jats:italic>\u00a0=\u00a0208,<jats:italic>M<\/jats:italic>age\u00a0=\u00a054.96,<jats:italic>SD<\/jats:italic>\u00a0=\u00a021.65), matched on sex into 104 younger (age range 18\u201364) and 104 older (age range 65\u201393) adults. An instrument is considered not to be age\u2010neutral if a collective large level of differential item functioning (DIF) exists in a group of items of an instrument (i.e., 25% or more with DIF). We therefore set out to detect possible DIF in the following ICD\u201011 self\u2010report measures: the Standardized Assessment of Severity of Personality Disorder (SASPD), the Personality Inventory for ICD\u201011 (PiCD), and the Borderline Pattern Scale (BPS).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>DIF analyses using a non\u2010parametric odds ratio approach demonstrated that SASPD, PiCD, and BPS were age\u2010neutral with less than 25% of items showing DIF. Yet, impact of DIF at scale level, examined by way of differential test functioning (DTF), indicated a DTF effect on the SASPD total score.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>These results of age\u2010neutrality of the PiCD and BPS are promising for measuring ICD\u201011 traits and the borderline pattern. Yet, the age\u2010neutral measurement of PD severity requires further research. With a rapidly aging population, its accurate assessment across the entire adult life span, including older age, is a prerequisite for an adequate detection of PDs.<\/jats:p><\/jats:sec>","DOI":"10.1002\/gps.6075","type":"journal-article","created":{"date-parts":[[2024,3,9]],"date-time":"2024-03-09T06:39:51Z","timestamp":1709966391000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Can personality disorder be accurately assessed in older age? 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