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USW1_PUBH_3100_W3EpidemiologicalModelsSlides.pptThree Epidemiological Models
Epidemiological Triangle
Web of Causation
The Wheel Model
© 2011 Laureate Education, Inc.
© 2011 Laureate Education, Inc.
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Epidemiological Triangle
Epidemiological Triangle
Model used for many years
Three segments
Host: degree that a person is able to adapt to stressors
Agent: biological, chemical, or physical
Environment: influences probability of contact between host and agent
Implies that each segment must be analyzed and understood in order to predict a disease
© 2011 Laureate Education, Inc.
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AGENT
ENVIRONMENT
HOST
Epidemiological Triangle Concept
© 2011 Laureate Education, Inc.
INTERACTION
© 2011 Laureate Education, Inc.
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Web of Causation
Web of Causation
Effects never depend on single isolated causes
Web develops as a result of chains of causation
Each link is the result of a complex genealogy
© 2011 Laureate Education, Inc.
© 2011 Laureate Education, Inc.
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INCOME
NUTRITION
FAMILY
EDUCATION
MOTIVATION
HEALTH
- Social and financial security
- Disposable food budget
- Dietary intake
- Food supply
Quality
Availability
- Size
- Composition
- Incentives
- Availability
- Personal attributes
Knowledge
Skills
Comprehension
- Wanted vs.
unwanted pregnancy
- Program
Compliance
Adherence
- Health status
- Health services
Availability
Accessibility
Acceptability
Web of Causation
Pregnancy Outcomes
© 2011 Laureate Education, Inc.
© 2011 Laureate Education, Inc.
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The Wheel Model
Consists of a hub (host or human) that has genetic makeup as its core
Surrounding host is the environment
Biological
Social
Physical
Implies a need to identify multiple etiological factors of disease without emphasizing the agent of disease
The Wheel Model
© 2011 Laureate Education, Inc.
© 2011 Laureate Education, Inc.
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Man – Environment Interactions
The Wheel Model
Biological Environment
Physical Environment
Social Environment
Genetic Core
© 2011 Laureate Education, Inc.
© 2011 Laureate Education, Inc.
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