Epidemiology Terms: Sensitivity, Specificity & Risk Measures
Key Epidemiology and Biostatistics Terms
This document defines core epidemiology and biostatistics concepts used in clinical research and public health.
Diagnostic Test Measures
- Sensitivity: The probability that an individual with the disease tests positive. High sensitivity is useful to rule out disease when the test is negative.
- Specificity: The probability that a healthy individual tests negative. High specificity is useful to confirm disease when the test is positive.
Population Prevalence and Incidence
- Prevalence: The total number of existing cases in the population divided by the total population at a given time.
- Incidence: The occurrence of new cases of a disease in a population over a specified period.
- Cumulative incidence (individual risk)