Long-Term Test–Retest Stability of ANAM in a Large Military Sample

Abstract

Abstract Objective This paper examines the long-term stability of the Automated Neuropsychological Assessment Metrics (ANAM) over 1-year, 3-year, and 5-year time periods. Methods The sample was drawn from active duty military personnel. All individuals were administered the ANAM and were re-administered the ANAM a second time, either 1 year, 3 years, or 5 years later. All individuals had no reported cognitive problems or concussion or any traumatic brain injury between the first and second assessments and had no intervening contact with the ANAM. All were assessed using the military standard approach with trained proctors. Results The results for (n = 19,997) individuals who were tested 1 year apart showed an intra-class correlation (ICC) of .6 for simple reaction time and simple reaction time repeat and .7 and above for all other scales. For the sample with 3 years between testings (n = 9,166), the ICC was similar to the 1-year sample. When the 5 year between testings data was examined (n = 2,270), the ICCs for all scales except the simple reaction time and simple reaction time repeat showed ICCs of .7 and.8. The simple reaction time and simple reaction time repeat showed ICCs of .596. Conclusions These results indicate that the use of the ANAN baseline for comparison can be done even if the baseline is up to 5 years old.