Finnish Registry Links 15-Year Productivity Drop to Early-Onset Dementia Across Subtypes

The retrospective cohort matched 793 early-onset dementia cases to 7,926 controls using national tax, education, and comorbidity registries. Productivity was quantified via inflation-adjusted annual income differentials after covariate adjustment. Frontotemporal dementia showed losses from 11 years pre-diagnosis, Alzheimer's from six years, and alpha-synucleinopathies only at diagnosis, revealing subtype-specific trajectories that precede clinical recognition by more than a decade.

This longitudinal signal extends beyond the reported association by aligning with emerging biomarker data: subtle executive-function decline measurable in occupational output precedes CSF or PET abnormalities in many cases. Workplace absenteeism and performance metrics therefore represent an underutilized, scalable proxy for cognitive reserve depletion that current diagnostic pathways, reliant on patient-initiated memory complaints, routinely miss.

Implementation barriers remain substantial. Privacy regulations, employer incentives, and false-positive rates in productivity surveillance require prospective validation before any screening protocol. The next required studies must combine serial neuropsychological batteries with income trajectories in occupation-stratified cohorts to establish actionable thresholds and test whether targeted interventions alter employment duration.