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Heart Attack Indicator: Hospitalizations Measure: Age-adjusted heart attack hospitalization rates
Data used in the calculation of these measures were collected by the Oregon Association of Hospitals and Health Systems for the Hospital Discharge Index (HDI). The HDI provides a central database of all Oregon hospital discharges for public health surveillance and hospital policy analysis. Information on emergency room visits, urgent care, outpatient surgery and clinic visits is not included in this database.
Before EPHT, there was no single heart attack surveillance system in place in the US. Mortality was currently the sole descriptor for national data for heart attacks. Estimates of incidence and prevalence of heart attacks and coronary heart disease were largely based on survey samples or large cohort studies.
Tracking heart attack hospitalizations will provide more information than death certificates or surveys, and will help with examination of time and geographic trends in heart attack hospitalizations, and evaluation of differences by age, gender and race/ethnicity.
Age-adjusted hospitalization rates are presented below. These rates are adjusted to the age structure of the 2000 US population so that the fact that heart attacks are more prevalent among older people and that Oregon has a higher proportion of older people than the US in general do not make the rates for Oregon seem artificially high.
Heart attack hospitalizations in Oregon and the United States decreased between 2000 and 2006. In addition, heart attack hospitalization rates were significantly lower in Oregon compared to the rest of the country. The reasons for Oregon’s low heart attack rates are not clear.
Hospitalization rates were higher in rural compared to urban counties from 2000 to 2003, but became almost identical in 2004. This shows that the differences in crude rates observed between rural and urban areas were mostly due to age differences that have been factored out here.
Table 1: Age-adjusted annual heart attack hospitalization rates from 2000 to 2006, by year and county
Graph 1: Age-adjusted annual heart attack hospitalization rate for Oregon, by year from 2000 to 2006
Map 1: Age-adjusted annual heart attack hospitalization rates for Oregon counties
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Table 1: Age-adjusted annual heart attack hospitalization rates from 2000 to 2006, by year and county. Rates based on less than 10 events are unstable and marked with an asterisk (*).
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Graph 1: Age-adjusted annual heart attack hospitalization rate for Oregon, by year from 2000 to 2006.
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Graph 2: Age-adjusted annual heart attack hospitalization rates for persons aged 35 and older, averaged from 2000 to 2006.
County rates are shown as blue squares, while the 95% confidence intervals (CI) are indicated by black horizontal lines. The vertical dotted line indicates the Oregon average rate. A county rate is considered statistically higher (or lower) than the Oregon average if the entire CI lies above (or below) the Oregon average. If the CI includes the Oregon average, the county rate is considered statistically similar to the Oregon average.
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Map 1: Age-adjusted annual heart attack hospitalization rates for Oregon counties.
The rates are shown in three statistical categories. higher than, similar to, or lower than the Oregon rate. Data are summarized for 2000 to 2006. Statistical significance was determined by comparing the 95% confidence interval of the county rate with the State rate.
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