Incidence: The number of new cases of a disease that develop in a specified population during a specific time period. It measures the risk of developing the disease.
Formula:
[
\text{Incidence Rate} = \frac{\text{New Cases}}{\text{Population at Risk}} \times 1000
]
Prevalence: The total number of existing cases (new and pre-existing) of a disease in a population at a specific point in time. It reflects disease burden.
Formula:
[
\text{Prevalence} = \frac{\text{Total Cases}}{\text{Total Population}} \times 100
]
Risk Factor: An attribute, characteristic, or exposure that increases the likelihood of developing a disease. It can be behavioral, environmental, or genetic.
Epidemiological Study Design: A systematic approach to investigate health-related states, including descriptive (e.g., cross-sectional) and analytical (e.g., cohort, case-control, RCT) studies.
Measures of Association: Quantitative tools (e.g., Risk Ratio, Odds Ratio) used to assess the strength of the relationship between exposure and disease.
1. What is the term for the number of new cases of a disease that develop in a specific population during a defined time period?
2. What is the primary purpose of epidemiology as a science?
3. Which of the following disease frequency measures is calculated by dividing the total number of deaths in a population during a specific period by the total population, often expressed per 1,000 or 100,000 individuals?
Incidence — definition?
New cases in a population over time.
Incidence — definition?
New cases over a time period.
Study designs — purpose?
Investigate health-related states systematically.
Prevalence — definition?
Existing cases at specific time.
Outbreak investigation — steps?
Verify, describe, hypothesize, test, control.
Risk Factor — role?
Increases disease development likelihood.
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