Performance validity testing in a clinical sample of adults with sickle cell disease.CONCLUSIONS: Using the RDS as a measure of performance validity among individuals presenting with a possibility of dementia increases the risk of misinterpreting genuine cognitive impairment as invalid performance when higher cutoffs are used lower cutoffs may be useful when interpreted in conjunction with other measures of performance validity. Those scoring below cutoffs performed worse on cognitive measures compared with those falling above cutoffs. RESULTS: A cutoff score of ≤7 resulted in a high prevalence of below-criterion performance (29.7%), though an RDS of ≤6 was associated with fewer below-criterion scores (12.8%) and prevalence of an RDS of ≤5 was infrequent (4.3%). One-way ANOVA was used to compare performance on a cognitive screening measure and informant reports of functional independence of those falling below and above cutoffs. Score distributions were examined to establish the base rate of below criterion performance for RDS cutoffs of ≤7, ≤6, and ≤5. METHOD: The RDS was calculated for each participant in the context of a comprehensive neuropsychological assessment completed as part of routine clinical care. The current study evaluated performance of the RDS in a clinical sample of 934 non-litigating individuals presenting to an outpatient memory disorders clinic for assessment of dementia. An RDS score of ≤7 is commonly referenced as indicative of invalid performance however, few studies have examined the classification accuracy of the RDS among individuals suspected for dementia. N2 - OBJECTIVE: The Reliable Digit Span (RDS) is a well-validated embedded indicator of performance validity. JF - Archives of clinical neuropsychology : the official journal of the National Academy of Neuropsychologists KW - Malingering/symptom validity testing T1 - Prevalence of below-criterion Reliable Digit Span scores in a clinical sample of older adults.
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