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Using base rates of low scores to interpret the ANAM4 TBI-MIL battery following mild traumatic brain injury.

Publication Status: Published

Sponsoring Organization: Defense Health Agency (formerly TRICARE Management Activity)

Sponsoring Office: Defense and Veterans Brain Injury Center

Congressionally Mandated: No

Funding Source: Undetermined

Release Date/Publication: February 01, 2015

Principle Investigator Status: Government

Primary DoD Data Source: Other Clinical

Secondary DoD Data Source:

Abstract

Base rates of low ANAM4 TBI-MIL scores were calculated in a convenience sample of 733 healthy male active duty soldiers using available military reference values for the following cutoffs: ≤2nd percentile (2 SDs), ≤5th percentile, <10th percentile, and <16th percentile (1 SD). Rates of low scores were also calculated in 56 active duty male soldiers who sustained an mTBI an average of 23 days (SD = 36.1) prior. 22.0% of the healthy sample and 51.8% of the mTBI sample had two or more scores below 1 SD (i.e., 16th percentile). 18.8% of the healthy sample and 44.6% of the mTBI sample had one or more scores ≤5th percentile. Rates of low scores in the healthy sample were influenced by cutoffs and race/ethnicity. Importantly, some healthy soldiers obtain at least one low score on ANAM4. These base rate analyses can improve the methodology for interpreting ANAM4 performance in clinical practice and research.

Citation:

Ivins BJ, Lange RT, Cole WR, Kane R, Schwab KA, Iverson GL. Using base rates of low scores to interpret the ANAM4 TBI-MIL battery following mild traumatic brain injury. Arch Clin Neuropsychol. 2015 Feb;30(1):26-38.

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