Digital cognitive testing is becoming central to large cohort studies, but interpretation depends on norms that reflect the population being studied. This BRACE paper turns an iPad-based cognitive screener into a more useful research instrument by deriving regression-based norms in MACS/WIHS participants without HIV who were comparable to participants with HIV. For collaborators and reviewers, the importance is practical: the work makes cognitive scores more interpretable across age, education, HIV status, and biological sex in a large, diverse cohort.
- The study analyzed BRACE performance from 2,937 MACS/WIHS Combined Cohort Study participants, including 1,063 people without HIV and 1,874 people with HIV.
- BRACE measured performance on tablet-based Trail Making, Stroop-Color, and Visual-Spatial Learning tasks.
- Regression-based norms were derived from people without HIV; an age-plus-education model was selected to support generalizable interpretation without race-based correction.
- Cognitive performance was largely comparable between people with and without HIV; statistically significant differences were small in magnitude.
- Age, education, diabetes, and cannabis use were more informative for BRACE performance than many HIV-specific clinical variables after standardization.
BRACE is an iPad-based way to measure cognitive performance. This paper asks how BRACE scores should be interpreted in a large HIV cohort, rather than treating raw scores as self-explanatory. By creating norms from demographically comparable people without HIV, the study gives researchers a clearer baseline for evaluating cognition in people with HIV and for following cognitive health over time.