Advancing diagnostic consistency: Statistical methods and interrater reliability in neuropsychological assessments with the MNB

In the field of neuropsychology, the accuracy of neuropsychological data interpretation has significant implications for both research and clinical practice. The process of test interpretation is fraught with challenges, and a lack of consensus among neuropsychologists can lead to discrepancies in assessment outcomes. Smith et al. (2020) identified this concerning lack of consensus in test score interpretation, raising questions about the standardization of interpretive practices within the field. Similarly, Tuokko and Gabriel (2006) reported moderate interrater agreement in identifying cognitive impairments, with a 77.7% consensus rate, using both history and all available information. The current study investigated the extent to which independent neuropsychologists could reach consistent diagnostic conclusions using only numeric data and the statistical methods available in the Meyers Neuropsychological Battery (MNB), without access to clinical history or contextual information. The results demonstrated a high degree of accuracy, with an overall agreement rate of 85.5% to 92.2% among the six raters. This finding underscores the potential of standardized statistical approaches to enhance the objectivity and consistency of neuropsychological assessments. The study advances neuropsychological assessment methodology by showing that statistical pattern-matching techniques can yield reliable and uniform diagnostic outcomes, even in the absence of additional clinical data.