# What Are Case Rates

According to the Centers for Disease Control and Prevention (CDC) the case rate is defined as “the number of reported cases of a disease in a given population during a specified time period.” Case rates are used to compare the risk of contracting a disease between different populations and to track changes in the incidence of a disease over time.

Case rates are usually expressed as the number of cases per 100000 people in a population. For example if there are 100 reported cases of a disease in a population of 1000000 people the case rate would be 10 per 100000.

The CDC reports case rates for various diseases and conditions such as influenza tuberculosis and HIV/AIDS. Case rates can also be used to compare the incidence of different diseases between different populations. For example the CDC has reported that the case rate of tuberculosis is much higher among Hispanics than among whites.

When interpreting case rates it is important to consider the size of the population being studied and the length of time over which the cases were reported. A small increase in the case rate of a disease in a large population may not be significant while a small decrease in the case rate in a small population may be more significant. In addition case rates can vary widely from one year to the next so it is important to look at trends over time.

## What is a case rate?

Answer: A case rate is the number of cases of a disease per 100000 people in a population.

## Why are case rates used?

Answer: Case rates are used to compare the risk of developing a disease between different groups of people.

## What factors can affect case rates?

Answer: The size of the population being studied the age of the population and the overall health of the population can all affect case rates.

## How are case rates calculated?

Answer: Case rates are calculated by dividing the number of cases of a disease by the total population size and multiplying by 100000.

## What diseases have high case rates?

Answer: Diseases that have high case rates include tuberculosis HIV and malaria.

## What diseases have low case rates?

Answer: Diseases that have low case rates include cancer and heart disease.

## Are case rates always accurate?

Answer: No case rates are not always accurate.

They can be affected by underreporting and overreporting of cases as well as by changes in the population size.

## What are the limitations of case rates?

Answer: The limitations of case rates include the fact that they can be affected by underreporting and overreporting of cases as well as by changes in the population size.

## What is the difference between a total case rate and a crude case rate?

Answer: A total case rate includes all cases of a disease while a crude case rate only includes cases that were reported.

## How can case rates be used to compare different populations?

Answer: Case rates can be used to compare the risk of developing a disease between different groups of people.

## What is the difference between a incidence rate and a case rate?

Answer: An incidence rate is the number of new cases of a disease per 100000 people in a population while a case rate includes all cases of a disease.

## What is the difference between a prevalence rate and a case rate?

Answer: A prevalence rate is the number of people with a disease per 100000 people in a population while a case rate includes all cases of a disease.

## What is the difference between a mortality rate and a case rate?

Answer: A mortality rate is the number of deaths due to a disease per 100000 people in a population while a case rate includes all cases of a disease.

## What is the difference between an attack rate and a case rate?

Answer: An attack rate is the number of people who develop a disease per 100000 people in a population while a case rate includes all cases of a disease.

## What is the difference between a notification rate and a case rate?

Answer: A notification rate is the number of cases of a disease that are reported to authorities per 100000 people in a population while a case rate includes all cases of a disease.