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

Brian J. Ivins*, Rael T. Lange, Wesley R. Cole, Robert Kane, Karen A. Schwab, Grant L. Iverson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

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.

Original languageEnglish
Pages (from-to)26-38
Number of pages13
JournalArchives of Clinical Neuropsychology
Volume30
Issue number1
DOIs
StatePublished - 1 Feb 2015
Externally publishedYes

Keywords

  • Base rates
  • Cognitive testing
  • Low scores
  • Mild traumatic brain injury
  • Military

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