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 Module IV Home Objectives Using Statistical Measures Frequency Distributions Ratios, Proportions, Rates Morbidity Frequency Measures Mortality Frequency Measures Relative Risk & Odds Ratio Outbreak Exercises Quiz Outline

# Statistical Measures

## Morbidity Frequency Measures

• Several standard measures are used to measure and describe the frequency of disease.
• Each measure has its appropriate uses, depending on the situation and the information available to the epidemiologist.
• The two main types of rates are:
• incidence
• prevalence

## Incidence Rates

• Incidence rates are the most common way of measuring and comparing the frequency of disease in populations.
• Incidence is a measure of risk.
• When Population A has a higher incidence of a disease than Population B, we can say that Population A has a higher risk of developing the disease than Population B. If it is a lot higher, we could say that Population A is a high-risk group for that disease.