Regional variation in ischemic heart disease incidence

Area of Science:

• Cardiovascular epidemiology
• Public health research
• Geographic health disparities

Background:

• Ischemic heart disease (IHD) remains a leading cause of mortality.
• Regional variations in IHD incidence suggest underlying environmental or socioeconomic influences.
• Understanding these disparities is crucial for targeted public health interventions.

Purpose of the Study:

• To investigate the relationship between cardiovascular risk factors and regional variations in IHD incidence.
• To identify if known risk factors explain geographical differences in IHD rates among white males aged 55-74.
• To explore regional variations in the impact of specific risk factors on IHD.

Main Methods:

• Utilized data from the NHANES I Epidemiologic Followup Study.
• Analyzed age-adjusted IHD incidence rates across different US regions (West vs. Non-West).
• Employed proportional hazards models to adjust for baseline risk factors including smoking, education, hypertension, cholesterol, diabetes, and BMI.

Main Results:

• The West region exhibited the lowest age-adjusted IHD incidence rate (31.3 per 1000 person-years).
• The Non-West region (Northeast, Midwest, South combined) had a higher rate (42.4 per 1000 person-years).
• Regional differences in IHD incidence were not explained by the assessed risk factors; the Non-West remained associated with a 38% higher IHD risk after adjustment. The influence of hypertension, diabetes, and BMI on IHD varied by region.

Conclusions:

• Significant regional disparities in IHD incidence exist among white males aged 55-74, independent of common cardiovascular risk factors.
• Geographical location plays a role in IHD risk, suggesting factors beyond individual-level risk profiles are involved.
• Further research is needed to elucidate the specific regional determinants contributing to these observed heart disease patterns.