A community health nurse is preparing an in-service for staff to define the conditions of causation in epidemiology studies. Which of the following descriptions should the nurse use to define a cessation of exposure to establish causation?
"When the exposure is decreased or eliminated, the risk of disease declines or is eliminated."
"The exposure must come before the disease develops.
"A relationship is biologically possible, and it makes sense."
"Increased exposure increases the risk of developing the disease."
The Correct Answer is A
Choice A: "When the Exposure is Decreased or Eliminated, the Risk of Disease Declines or is Eliminated."
This statement accurately describes the concept of cessation of exposure in establishing causation. According to the Bradford Hill criteria, if a factor is truly causal, reducing or eliminating exposure to that factor should lead to a decrease in the incidence of the disease. This principle helps to confirm the causal relationship between the exposure and the disease.
Choice B: "The Exposure Must Come Before the Disease Develops."
This statement refers to the temporal relationship criterion in the Bradford Hill criteria, which states that for an exposure to be considered causal, it must precede the onset of the disease. While this is an important aspect of establishing causation, it does not specifically address the concept of cessation of exposure.
Choice C: "A Relationship is Biologically Possible, and it Makes Sense."
This statement pertains to the biological plausibility criterion, which suggests that the observed association between an exposure and a disease should be consistent with existing biological and medical knowledge. While biological plausibility is crucial for establishing causation, it does not directly relate to the cessation of exposure.
Choice D: "Increased Exposure Increases the Risk of Developing the Disease."
This statement describes the dose-response relationship, another criterion in the Bradford Hill framework. It indicates that a greater level of exposure to a risk factor should correspond to a higher risk of developing the disease. Although this is an important aspect of causation, it does not specifically address the cessation of exposure.
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Related Questions
Correct Answer is C
Explanation
Choice A Reason:
Partnering with local churches and writing grants for childcare funding towards affordable daycares is a valuable initiative. It addresses the need for accessible childcare, which can significantly impact community health by allowing parents to work and support their families. However, this action does not directly address the immediate health risks posed by older homes, such as lead-based paint.
Choice B Reason:
Advocating for more transportation to health care facilities is crucial in rural areas where access to healthcare can be limited. Improved transportation can ensure that residents receive timely medical care, which is essential for maintaining overall health. Nonetheless, this action does not specifically target the health hazards associated with older homes.
Choice C Reason:
Teaching residents about the dangers of lead-based paint is the most direct and relevant action for a community health nurse working in an area with many homes built before the 1970s. Lead-based paint poses significant health risks, especially to children, including developmental delays and other serious health issues. Educating the community about these dangers and how to mitigate them can have an immediate and profound impact on public health.
Choice D Reason:
Partnering with a nonprofit organization for the farmers' market to sell fresh produce twice a week is an excellent way to promote healthy eating and improve nutrition in the community. Access to fresh produce can help prevent chronic diseases and improve overall health. However, like choices A and B, this action does not directly address the specific health risks associated with older homes.
Correct Answer is C
Explanation
Choice A Reason:
This statement is incorrect because it describes a true negative, not a false negative. A true negative occurs when the test correctly identifies that a person does not have the disease. In a two-by-two table, this is represented in the cell where both the actual status and the test result indicate no disease.
Choice B Reason:
This statement is incorrect because it describes a true positive, not a false negative. A true positive occurs when the test correctly identifies that a person has the disease. In a two-by-two table, this is represented in the cell where both the actual status and the test result indicate the presence of the disease.
Choice C Reason:
This statement is correct because it accurately describes a false negative. A false negative occurs when the test incorrectly indicates that a person does not have the disease when, in fact, they do. In a two-by-two table, this is represented in the cell where the actual status indicates the presence of the disease, but the test result indicates no disease.
Choice D Reason:
This statement is incorrect because it describes a false positive, not a false negative. A false positive occurs when the test incorrectly indicates that a person has the disease when, in fact, they do not. In a two-by-two table, this is represented in the cell where the actual status indicates no disease, but the test result indicates the presence of the disease.
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