Geographically overlapping Alzheimer's disease registries: comparisons and implications

Area of Science:

• Neurology
• Epidemiology
• Biostatistics

Background:

• Registries are databases for individuals with shared characteristics, often criticized for non-representative sampling.
• Two distinct Alzheimer's disease registries, ADPR and ADRC, were compared.
• These registries share resources but differ in study mission and recruitment.

Purpose of the Study:

• To compare demographic and cognitive characteristics of subjects in two Alzheimer's disease registries.
• To evaluate how different recruitment strategies impact registry representativeness.
• To identify differences between an incident-based registry and a research center-based registry.

Main Methods:

• Comparison of subject demographics and cognitive features at entry.
• Analysis of recruitment strategies based on registry mission (epidemiologic vs. phenomenologic/biologic/pharmacologic).
• Utilized data from an incident-based Alzheimer's Disease Patient Registry (ADPR) and an Alzheimer's Disease Research Center (ADRC) registry.

Main Results:

• Incident-based ADPR subjects were older with shorter time from symptom onset to recruitment.
• ADPR subjects were less demented and demographically mirrored the general population more closely.
• ADRC registry had a higher proportion of subjects with advanced educational attainment.

Conclusions:

• Registry mission significantly influences recruitment strategies and subject characteristics.
• Incident-based registries may offer better demographic representation for epidemiologic studies.
• Differences in registries necessitate careful consideration for study design and generalizability.