Longitudinal persistence index
BioMIR pairs a modeled age-equivalent contribution with a longitudinal persistence index: the proportion of qualified modeled days in High or Highest tiers, with fitted trends across prespecified periods. This is descriptive context, not disease probability or a validated clinical threshold. Independent studies must test repeatability, responsiveness and incremental information beyond the latest measurement and conventional averages, while separating held inputs from original observations and accounting for correlated repeated days. A 9 October 2026 draft amendment to the working v1.3 protocol specifies analytical checks, independent participant/time-forward evaluation, freshness sensitivity and human-factors endpoints; clinical and biostatistical review, preregistration and study execution remain pending.
The study plan freezes tiers, windows, denominator and version lineage. Clinical utility and any future referral thresholds require separate evidence and approval. Research collaborators can propose independently measured endpoints, acquisition schedules and participant-level external evaluation designs.