Burden (Case Rate): Total number of cases per 100,000 Wisconsin residents in the last two weeks. Low = case rate is less than or equal to 10; Moderate = case rate is greater than 10, but less than or equal to 50; Moderately High = case rate is greater than 50, but less than or equal to 100; High = case rate is greater than 100.
Case Fatality Rate: Proportion of deaths from a disease compared to the total number of people diagnosed with the disease.
Deaths: Deaths per day, caused by COVID-19 Deaths per week, caused by COVID-19.
Hospitalizations/ICU use: Number of COVID-19 patients who have been hospitalized or put in the ICU.
Infection Fatality Rate: Proportion of deaths from a disease compared to all infected individuals. Differs from Case Fatality rate in that it tries to account for undiagnosed and asymptomatic cases.
Mortality Rate: Deaths caused by a disease in a population over a period of time. Mortality rates are hard to predict, and may be better for looking at the past.
Non-surge capacity of hospital & ICU beds & ventilators: Hospital and equipment capacity for normal, day-to-day hospital needs.
Positivity Rate: Two main measures that may vary from one data source to another. Person-based measure: calculated as percentage of people who test positive divided by total number of people tested (used by the Medical College of Wisconsin due to data availability). Test-based measure: calculated as percentage of tests completed that are confirmed positive.
Reproductive Number (R0): Number of people infected by one sick person. Number changes as behavior changes or immunity develops. If R0 is higher than 1, the number of cases increases exponentially. If R0 is lower than 1, the disease will eventually stop spreading.
Testing Capacity: The number of tests able to be performed per day in Wisconsin. Limited by availability of supplies (reagents and swabs) and number of tests that can be analyzed in a certain period.
Trajectory (Percent Case Change): Percent change from previous week to current week. Includes a “p-test”, which indicates probability. The smaller the number, the more probable it is that the trajectory is shrinking. Shrinking = percent change in cases is less than or equal to -10%, and the p-value is less than 0.025; Growing = percent change in cases is greater than or equal to 10%, and p-value is less than 0.025; No Significant Change = any percentages or p-values besides those described by shrinking and growing.
Learn how to navigate the numbers (PDF)