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, 20 (4), 346-52

Determining the Accuracy of Self-Report Versus Informant-Report Using the Conners' Adult ADHD Rating Scale

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Determining the Accuracy of Self-Report Versus Informant-Report Using the Conners' Adult ADHD Rating Scale

Lisa Alexander et al. J Atten Disord.

Abstract

Objective: The present research examined the validity of self-report versus informant-report in relation to a performance-based indicator of adult ADHD.

Method: Archival data from 118 participants (52 males, 66 females) were used to compare Conners' Adult ADHD Rating Scale-Self-Report: Long Format (CAARS-S:L) and Conners' Adult ADHD Rating Scale-Observer Report: Long Format (CAARS-O:L) with discrepancy scores calculated between the Wechsler Adult Intelligence Scale-Third Edition (WAIS-III) Verbal Comprehension Index - Working Memory Index (VCI - WMI) and Perceptual-Organizational Index - Processing Speed Index (POI - PSI) scaled scores.

Results: Neither the self- nor informant-report formats of the CAARS were better predictors of discrepancies between WAIS-III Index scores. Intercorrelations between the CAARS-S:L and CAARS-O:L revealed generally higher correlations between the same scales of different formats and among scales measuring externally visible symptoms. Furthermore, regression analysis indicated that both the CAARS-S:L and CAARS-O:L clinical scales contributed a significant proportion of variance in WAIS-III VCI - WMI discrepancy scores (14.7% and 16.4%, respectively).

Conclusion: Results did not establish greater accuracy of self-report versus informant-report of ADHD symptomatology, rather demonstrate the need for multimodal assessment of ADHD in adults.

Keywords: adult ADHD; assessment; informant-report; self-report; validity.

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