Key result
The Predicted-difference method classified subjects as impaired at a higher rate than other methods for the Auditory Delayed memory index (P < .05).
Why the study?
Do different methodologies (Predicted-difference, Simple-difference, Premorbid-estimation) yield different rates of impairment classification for IQ/memory score discrepancies in TBI patients?
Cross-Sectional (n=87)
Do different methodologies (Predicted-difference, Simple-difference, Premorbid-estimation) yield different rates of impairment classification for IQ/memory score discrepancies in TBI patients?
p-value: p=< .05
A combination of estimates of premorbid functioning and regression-based predicted scores is optimal for interpreting IQ/memory score discrepancies in TBI patients.
Predicted-difference may overestimate auditory memory impairment in TBI; leaves open optimal discrepancy method pending longitudinal validation.
Discrepancies between WAIS-III and WMS-III scores for a group of 39 males and 48 females with a history of TBI were examined using three methodologies: Predicted-difference, Simple-difference, and Premorbid-estimation methods. Overall, the Predicted-difference method tended to classify the fewest individuals as impaired based on statistical rarity of discrepancies (11-16% classified as impaired), while the regression-based Premorbid method tended to classify the fewest individuals as impaired based on clinical rarity of discrepancies (4-8% classified as impaired). Degree of agreement is reported and was substantial. The only comparison between methods to reach statistical significance was the Predicted-difference method classifying subjects as impaired at a higher rate than other methods for Auditory Delayed memory index (Cochran's Q = 7.00, P < .05). Findings suggest a combination of estimates of premorbid functioning and regression-based predicted scores is optimal for interpreting IQ/memory score discrepancies. Clinical implications are discussed.
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Reid Laughlin Skeel (2003) conducted a cross-sectional in Traumatic Brain Injury (TBI) (n=87). Predicted-difference, Simple-difference, and Premorbid-estimation methodologies vs. Comparison between methodologies was evaluated on Classification of individuals as impaired based on IQ and memory score discrepancies (p=< .05). The Predicted-difference method classified subjects as impaired at a higher rate than other methods for the Auditory Delayed memory index (P < .05).
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