Objective-Recent evidence suggests that some of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition personality disorder (PD) criteria contain measurement bias across age groups. Specifically, this research showed that younger and older adults were differentially likely to endorse certain PD criteria, even when both groups were statistically matched using mechanisms of item response theory (IRT) for degree of PD pathology. For the analyses presented here, the authors used data from a large epidemiological study (N=43,093), the National Epidemiologic Survey on Alcohol and Related Conditions, to examine the influence of this item-level measurement bias for reaching accurate algorithmic PD diagnoses of older adults.Methods-Joint probability analyses were used to determine the net effect of the item-level bias on the possible over-or underdiagnosis of six PDs in older adults.Results-When older adults were compared to younger adults at equivalent levels of PD pathology, they were more likely to receive diagnoses of obsessive-compulsive and schizoid PDs. In contrast, they were less likely to receive diagnoses of avoidant and dependent PDs. Younger and older adults were equally likely to receive diagnoses of histrionic and paranoid PDs. Of the seven PDs assessed in this dataset, only these six lend themselves to this type of analysis; antisocial PD differs because a diagnosis depends upon the presence of conduct disorder.Conclusion-These findings raise concerns regarding the interpretation of existing older adult PD prevalence data.
KeywordsAge bias; item response theory; personality disorder Concern over possible age bias in Diagnostic and Statistical Manual of Mental Disorders (DSM) personality disorder (PD) criteria dates back to the publication of DSM-III. 1 Since that time, clinicians and researchers who work with older adults have recommended that DSM criteria should be used cautiously with this age group. 2,3 These advocates noted that approximately 25% of DSM criteria contain poor face validity for use with older adults.
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Author Manuscript Author Manuscript Author Manuscript Author ManuscriptThey pointed out, for example, that the criterion for avoidant PD ("avoids occupational activities that involve significant interpersonal contact …") may not be useful for the assessment of PD pathology in an older, retired person. 3 Although convincing arguments have been made about the limited face validity for many of the PD criteria, 3,4 only recently has there been empirical support for these arguments. 1 In a recent empirical study, 1 item response theory (IRT) analyses of a large public dataset indicated that approximately 29% of DSM-IV criteria were endorsed at different rates by younger and older adults when controlling for level of PD pathology. In other words, younger and older adults with the same amount of pathology endorsed specific items at different rates. This suggests that the items measure PD pathology differently across these age groups, a...