Risk factors for early-onset and late-onset dementia: a prospective cohort study

Area of Science:

• Neuroscience
• Epidemiology
• Public Health

Background:

• Early-onset dementia (before age 65) poses a significant health challenge.
• Understanding its risk factors is vital, yet often inferred from late-onset dementia studies.
• This study investigates demographic, clinical, and lifestyle factors associated with early-onset dementia.

Purpose of the Study:

• To identify risk factors for early-onset dementia.
• To compare these risk factors with those for late-onset dementia.
• To inform primary prevention strategies for early-onset dementia.

Main Methods:

• Pooled data from five longitudinal UK and USA cohort studies (N=544,442).
• Dementia ascertained via hospitalisation and death records.
• Cox regression models used to estimate hazard ratios for early- and late-onset dementia.

Main Results:

• Identified significant risk factors for early-onset dementia: Black race, low education, diabetes, depression, smoking, obesity, physical inactivity, and alcohol overconsumption.
• Female sex was associated with a lower hazard of early-onset dementia.
• Most identified risk factors showed stronger associations with early-onset dementia compared to late-onset dementia.

Conclusions:

• Modifiable risk factors play a critical role in the development of early-onset dementia.
• Findings highlight high-priority targets for primary prevention interventions.
• Further research is needed to refine prevention strategies for early-onset dementia.