Distinct trajectories of subjective cognitive decline before diagnosis of neurocognitive disorders: Longitudinal modelling over 18 years

SCD has distinctive trajectories among those who do and do not progress to NCD. The distinctive trajectories can inform NCD risk for early interventions, and guide public health messaging to distinguish high-risk SCD from normal ageing. Future SCD scales may possibly need to evaluate for symptom changes over a longer, 20-year horizon to better capture new onset of SCD within this longer timeframe.