Compared to Distribution

an indicator guage with the arrow in the green the value is in the best half of communities.

an indicator guage with the arrow in the yellow the value is in the 2nd worst quarter of communities.

an indicator guage with the arrow in the red the value is in the worst quarter of communities.

Compared to Target

green circle with white tick inside it meets target; red circle with white cross inside it does not meet target.

Compared to a Single Value

green diamond with downward arrow inside it lower than the comparison value; red diamond with downward arrow inside it higher than the comparison value; blue diamond with downward arrow inside it not statistically different from comparison value.

Trend

green square outline with upward trending arrow inside it green square outline with downward trending arrow inside it non-significant change over time; green square with upward trending arrow inside it green square with downward trending arrow inside it significant change over time; blue square with equals sign no change over time.

Compared to Prior Value

green triangle with upward trending arrow inside it higher than the previous measurement period; green triangle with downward trending arrow inside it lower than the previous measurement period; blue equals sign no statistically different change from previous measurement period.

green chart bars Significantly better than the overall value

red chart bars Significantly worse than the overall value

light blue chart bars No significant difference with the overall value

gray chart bars No data on significance available

COVID-19 Daily Average Case-Fatality Rate

State: Illinois

Measurement Period: Mar 3, 2023

This indicator shows the daily average confirmed deaths due to COVID-19 calculated from the daily average confirmed cases recorded in the preceding 7 days (for example, Jan 31 includes the daily average deaths between January 25 - January 31, 2020).

Numerator = daily average confirmed deaths in preceding 7 days

Denominator = daily average confirmed cases in preceding 7 days

Why is this important?

Case-fatality rate is the proportion of persons with a particular condition (cases) who die from that condition. It is a measure of the severity of the condition. The case-fatality rate is a proportion, not a true rate. As a result, some epidemiologists prefer the term case-fatality ratio. Case-fatality rate still is seen as the best tool to express the fatality of this disease; however, it may be an underestimate when widespread testing is not available. By showing the daily average case-fatality rate per week, this approach helps prevent major events (such as a change in reporting methods) from skewing the data and better allows visualizations overtime.

More...