Which of the following terms indicates the number or proportion of persons in a population who have a disease at any given point in time?
Sensitivity.
Prevalence.
Negative predictive value.
None of the above.
The Correct Answer is B
Choice A rationale
Sensitivity is a measure of a screening test's validity, specifically its ability to correctly identify individuals who have the disease (true positives). It is calculated as True Positives ÷ (True Positives + False Negatives). This parameter describes the test's performance, not the burden or frequency of the disease within the population at a specific time.
Choice B rationale
Prevalence quantifies the total number of existing cases (both new and old) of a disease or health condition in a defined population at a specific point in time or over a period. It is typically expressed as a ratio or a percentage. It is a critical epidemiological measure that indicates the burden of a disease on a community at a given moment.
Choice C rationale
Negative Predictive Value (NPV) is another measure of a screening test's validity. It is the probability that a person with a negative test result truly does not have the disease. It is calculated as True Negatives ÷ (True Negatives + False Negatives). Like sensitivity, this describes test performance, not disease frequency in the population.
Choice D rationale
This choice is incorrect because Prevalence (Choice B) is the specific epidemiological term used to describe the proportion of existing cases of a disease in a population at a point in time, thereby correctly answering the question.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Japan has a universal healthcare system and, while its health expenditure is significant, it spends less per capita on healthcare than the United States. Their system is characterized by strict government regulation of fees and mandatory insurance to control overall costs.
Choice B rationale
Canada operates a publicly funded, single-payer health care system that ensures universal access to medically necessary services. Due to centralized control over costs and pricing, its total and per capita health spending are substantially lower than the United States.
Choice C rationale
The United Kingdom (England) has the National Health Service (NHS), a publicly funded and administered healthcare system. This government control over provision and costs results in significantly lower health expenditure as a percentage of Gross Domestic Product (GDP) and per capita spending compared to the United States.
Choice D rationale
The United States consistently spends more per capita on health care and a higher percentage of its Gross Domestic Product (GDP) on health care than any other developed country in the world. This high cost is attributed to factors like higher prices for services and drugs, the complexity of the system, and the prevalence of chronic disease.
Correct Answer is D
Explanation
Choice A rationale
This is the primary function of the Occupational Safety and Health Administration (OSHA), a US federal agency. OSHA is responsible for ensuring safe and healthful working conditions by establishing and enforcing standards and providing training, outreach, education, and assistance to protect American workers from hazards in the workplace.
Choice B rationale
This describes the mission of the Special Supplemental Nutrition Program for Women, Infants, and Children (WIC), a US federal assistance program. WIC provides healthy foods, nutrition education, breastfeeding support, and health care referrals to low-income pregnant women, new mothers, and children up to age five who are at nutritional risk.
Choice C rationale
This goal is broadly aligned with the objectives of major US health care reform efforts, such as the Affordable Care Act (ACA). The ACA aimed to increase the number of Americans with health insurance and reduce the overall costs of health care by regulating the insurance industry and expanding public programs.
Choice D rationale
The World Health Organization (WHO) is the specialized agency of the United Nations concerned with international public health. A critical function of the WHO is to monitor, report on, and coordinate responses to outbreaks of internationally important diseases, like pandemics or epidemics, facilitating global cooperation to prevent their spread and improve worldwide health standards
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