A-248 Using Rates of Low Scores to Assess Agreement between CNSVS and a Traditional Battery of Neuropsychological Tests

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Abstract Objective CNSVS is a brief computerized test battery used to assess cognitive function. We compare intra-individual agreement between CNSVS and a battery of traditional neuropsychological tests using rates of low scores. Methods Complete and valid data from 246 healthy soldiers and 177 soldiers ≤ 7 days from sustaining mild TBI (mTBI) were used in this analysis. All soldiers were consecutively administered CNSVS and a traditional test battery consisting of: TOPF, WAIS-IV, CVLT-II, RCFT, DKEFS, and CPT-II. We performed base rate analyses of both batteries to determine the proportions of soldiers who had various numbers of scores that were 1.0+, 1.5+, and 2.0+ standard deviations below the normative mean. We used those rates to place Soldiers into a “low score hierarchy” ranging from the least poor (i.e. ~ > 10th %ile) to the worst overall performance (i.e. ~ ≤ 10th %ile). We then compared agreement between the batteries at each of those levels. Results More soldiers with mTBI had low scores than healthy soldiers on both batteries. Of the soldiers who performed at the worst level on one battery, 95.9% from CNSVS and 80.0% from traditional had some level of poor performance on the other battery. However, of the soldiers who performed at the worst level on either battery, only 38.8% from CNSVS and 63.3% from traditional also performed at the worst level on the other battery. Conclusion These batteries similarly identify poor performance to a degree, though with some potentially meaningful differences still present.