Abstract 141: Stroke Trends in Mexican Americans and non Hispanic Whites
Objective: As a primary, pre-specified objective of the population-based Brain Attack Surveillance in Corpus Christi (BASIC) project we studied trends in stroke occurrence among Mexican Americans (MAs) and non Hispanic whites (NHWs) in Corpus Christi, Texas. Previous work suggested higher stroke rates in MAs compared with NHWs.
Methods: We performed active and passive surveillance, and using source documentation, validated all stroke cases from January, 2000-December, 2010 in this community. Yearly population counts were obtained from the 2000, 2010 US Census and intercensal estimates. Incidence rates of total stroke (completed ischemic and intracerebral hemorrhage) were calculated per 10,000 population. Poisson regression models using the stroke counts within categories of race/ethnicity, age (45-59; 60-74, and 75+) and sex as the outcome and (log) population counts as the offset were used to estimate adjusted rates, rate ratios and time trends. Time trends were modeled as a linear term of years since 2000. The models used data from the entire study period to estimate incidence rates in 2000 and 2010.
Results: There were 3,086 strokes in MAs and 2,328 in NHWs. Between 2000 and 2010 stroke incidence declined by 3.8% per year (95%CI: 3.0%, 4.6%) (see Figure). In 2000 the incidence rate was 54.2/10,000, it was 35.9/10,000 in 2010. For those aged 45-59; 60-74, and 75+, the yearly declines were 0.6% (95%CI: 1.2%, 2.3%); 6.1% (95%CI: 4.8%, 7.5%); and 3.9% (95%CI: 2.6%, 5.1%) per year, respectively. The decline in stroke incidence was not significantly different by ethnicity in any age group. Within each age category, the ethnicity rate ratios in 2000 vs. 2010 were: 45-59, 2.23 vs 2.15 (p=0.87); 60-74, 1.58 vs 1.77 (p=0.45); and 75 or older, 1.17 vs 1.02 (p=0.29).
Conclusions: Stroke occurrence rates have declined dramatically in the last decade in both MAs and NHWs, particularly in those 60 and older. However, the disparity between MA and NHW stroke rates persists among those <75.
- © 2012 by American Heart Association, Inc.