Stroke in south Alabama: incidence and diagnostic features--a population based study

Area of Science:

• Epidemiology
• Neurology
• Public Health

Background:

• Stroke incidence varies significantly across different populations and geographic regions.
• The southeastern United States is known as the
• Stroke Belt
• due to higher stroke mortality and morbidity.
• Understanding local stroke epidemiology is crucial for targeted public health interventions.

Purpose of the Study:

• To determine the incidence and characteristics of stroke in a defined area of southern Alabama in 1980.
• To compare stroke incidence rates between racial groups (White and Black) and sexes.
• To assess whether the study area aligns with the characteristics of the
• Stroke Belt
• .

Main Methods:

• Retrospective identification of all hospitalized stroke cases in southern Alabama during 1980.
• Data collection included disease onset, clinical course, laboratory results, risk factors, and outcomes.
• Calculation of age-adjusted and age-specific incidence rates stratified by race and sex.

Main Results:

• The age-adjusted incidence of initial stroke was 109/100,000 for Whites and 208/100,000 for Blacks.
• Black individuals exhibited higher age-specific rates than Whites, with Black females having the highest rates.
• Common stroke types included infarction of unspecified origin (40%), embolic (26%), and lacunar (13%).
• Blacks had higher hemorrhage incidence rates, and Black females showed the highest lacunar stroke rate.
• Overall stroke incidence was not significantly higher than in previous population studies.

Conclusions:

• Southern Alabama's stroke incidence in 1980 did not support its classification within the
• Stroke Belt
• .
• Significant racial disparities in stroke incidence and type were observed, with Black individuals, especially females, being disproportionately affected.
• Further research is needed to understand the specific risk factors contributing to these observed disparities.