Midlife Inflammation and 20-Year Cognitive Decline in ARIC Cohort

12,336 participants from the Atherosclerosis Risk in Communities (ARIC) study were assessed for systemic inflammation using biomarkers like fibrinogen and C-reactive protein (CRP) during midlife. Their cognitive function in memory, executive function, and language was tracked over three visits spanning 20 years. The data supports analyses of associations between specific inflammatory markers and long-term cognitive trajectories.

Use Cases

• Model the association between the midlife inflammation composite score (from fibrinogen, white blood cell count, von Willebrand factor, Factor VIII) and 20-year decline in the cognitive composite score.
• Analyze the relationship between C-reactive protein (CRP) levels measured at Visit 2 and domain-specific cognitive decline, particularly in memory.
• Compare cognitive decline trajectories between participants in the top and bottom quartiles of the inflammation composite score or CRP levels.
• Investigate the interaction between demographic variables (e.g., baseline age, race, gender) and inflammatory biomarkers on long-term cognitive outcomes.

Strengths

• Longitudinal design with 12,336 participants and cognitive assessments spanning 20 years across three visits.
• Includes multiple specific inflammatory biomarkers: fibrinogen, white blood cell count, von Willebrand factor, Factor VIII, and C-reactive protein (CRP).
• Cognitive assessment covers multiple domains: memory, executive function, and language, allowing for domain-specific analysis.

Limitations

• Sample composition may have geographic or demographic biases (baseline age 56.8, 21% black, 56% women) limiting generalizability.
• Cognitive assessments were conducted at three time points over 20 years, which may not capture finer-grained temporal changes.
• The dataset is derived from an observational cohort study, limiting causal inference regarding inflammation and cognitive decline.

Provenance

Source

Atherosclerosis Risk in Communities (ARIC) cohort study.

Collection Method

Inflammatory biomarkers were measured from blood samples; cognition was assessed using standardized tests over three visits.

Time Range

Cognitive assessments span 20 years following midlife biomarker measurement.

Freshness

Data was last updated in 2019.

Geography

Data from the ARIC study, which recruited participants from four U.S. communities.