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A public health nurse is educating a newly licensed nurse about sensitivity and specificity using a two-by-two table. Which of the following statements by the newly licensed nurse indicates an understanding of the table related to true positives?

"True positives are represented in the table cell that indicates the person does not have the disease and the test indicates disease."

"True positives are represented in the table cell that indicates the person has the disease and the test indicates the person has the disease."

"True positives are represented in the table cell that indicates the person has the disease and the test does not indicate disease."

"True positives are represented in the table cell that indicates the person does not have the disease and the test does not indicate disease."

Answer and Explanation

The Correct Answer is B

Choice A: "True Positives are Represented in the Table Cell that Indicates the Person Does Not Have the Disease and the Test Indicates Disease."
This statement is incorrect. In a two-by-two table used to evaluate diagnostic tests, the cell representing true positives is where both the test result and the actual disease status are positive. This cell indicates that the test correctly identified individuals who have the disease. The statement here describes a false positive, where the test indicates disease, but the person does not actually have it.

Choice B: "True Positives are Represented in the Table Cell that Indicates the Person Has the Disease and the Test Indicates the Person Has the Disease."
This statement is correct. True positives are indeed represented in the cell where both the test result and the actual disease status are positive. This means the test has correctly identified individuals who have the disease. This cell is crucial for calculating the sensitivity of the test, which measures the proportion of actual positives correctly identified by the test.

Choice C: "True Positives are Represented in the Table Cell that Indicates the Person Has the Disease and the Test Does Not Indicate Disease."
This statement describes a false negative, where the person has the disease, but the test fails to detect it. This cell is used to calculate the test's sensitivity, but it does not represent true positives. False negatives are critical to understand because they indicate cases where the test missed the disease.

Choice D: "True Positives are Represented in the Table Cell that Indicates the Person Does Not Have the Disease and the Test Does Not Indicate Disease."
This statement describes true negatives, where the test correctly identifies individuals who do not have the disease. While true negatives are important for calculating the specificity of the test, they do not represent true positives. Specificity measures the proportion of actual negatives correctly identified by the test.

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Correct Answer is D

Explanation

Choice A Reason:
Proportionate mortality refers to the proportion of deaths in a population attributable to different causes. It is expressed as a percentage of total deaths. While useful for understanding the distribution of causes of death, it does not provide a direct comparison of overall mortality rates between different populations or regions.

Choice B Reason:
Case fatality rate is the proportion of individuals diagnosed with a particular disease who die from that disease within a specified period. It is a measure of the severity of the disease rather than the overall mortality rate. This metric is not suitable for comparing general mortality rates between a state and the entire country.

Choice C Reason:
Cause-specific mortality rate refers to the mortality rate from a specific cause of death within a population. While this can provide insights into the impact of particular diseases or conditions, it does not offer a comprehensive view of overall mortality. Comparing cause-specific mortality rates would require multiple comparisons for different causes, complicating the analysis.

Choice D Reason:
Crude mortality rate is the total number of deaths in a population over a specific period, usually expressed per 1,000 or 100,000 individuals. This rate provides a straightforward measure of the overall mortality in a population, making it the most appropriate metric for comparing mortality rates between a state and the entire country. It allows for a direct comparison of the general health status and mortality burden across different regions.

A. "I have a false negative screening. I may miss the opportunity for early treatment." B. "I have a false negative screening. I may undergo unnecessary treatment." C. "I have a false negative screening. I likely need more extensive testing." D. "I have a false negative screening. I may experience undue worry."

Correct Answer is A

Explanation

Choice A Reason:
"I have a false negative screening. I may miss the opportunity for early treatment." This statement accurately reflects the primary concern with a false negative result. A false negative occurs when a test incorrectly indicates that a person does not have a condition when they actually do. This can lead to a delay in diagnosis and treatment, potentially worsening the individual's health outcomes. Early treatment is often crucial for managing many conditions effectively, so missing this opportunity can have significant consequences.

Choice B Reason:
"I have a false negative screening. I may undergo unnecessary treatment." This statement is incorrect because a false negative result means the test failed to detect the condition, leading to no treatment when it is actually needed. Unnecessary treatment is more associated with a false positive result, where the test incorrectly indicates the presence of a condition.

Choice C Reason:
"I have a false negative screening. I likely need more extensive testing." While additional testing might eventually be necessary if symptoms persist or worsen, this statement does not directly address the immediate implication of a false negative result. The primary concern is the missed opportunity for early intervention, not the need for more testing.

Choice D Reason:
"I have a false negative screening. I may experience undue worry." This statement is also incorrect. A false negative result typically provides a false sense of security, leading the individual to believe they are healthy when they are not. Undue worry is more likely to result from a false positive, where the person is incorrectly told they have a condition.

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A public health nurse is educating a newly licensed nurse about sensitivity and specificity using a two-by-two table. Which of the following statements by the newly licensed nurse indicates an understanding of the table related to true positives?

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