Which of the following epidemiological measurements is related to mortality?

BTSC Staff Nurse 1 August-2025

Nursing Research & Statistics

Easy

Appeared in: BTSC Staff Nurse 1 August-2025

Explanation

The Case Fatality Rate (CFR) is the proportion of individuals diagnosed with a specific disease who die from that disease over a specified period.
It is a direct measure of the lethality or 'killing power' of a disease, thus it is fundamentally a mortality indicator.
The formula is: (Number of deaths from a disease ÷ Number of diagnosed cases of that disease) × 100.
It is particularly useful for assessing the severity of acute infectious diseases like Ebola or Cholera.

Option A: Point prevalence is a measure of morbidity, not mortality. It quantifies the proportion of a population that has a disease at a single point in time, indicating the overall burden of the disease in the community at that moment.
Option B: Disability-Adjusted Life Years (DALY) is a composite measure of overall disease burden. While it includes a mortality component (Years of Life Lost - YLL), it also includes a morbidity component (Years Lived with Disability - YLD). It is not a pure mortality measure like CFR.
Option C: Health-Adjusted Life Expectancy (HALE) measures the number of years a person can expect to live in full health. It adjusts overall life expectancy for the time spent in states of poor health. Its focus is on the quality of life, not just the mortality rate.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Identification of epidemiological measurements related to mortality as background academic context rather than a clinical decision trigger.
Understanding CFR is crucial for nurses, especially in public health and infectious disease control. A high CFR for a disease like COVID-19 or Ebola signals a severe public health threat, requiring immediate and stringent infection control protocols, patient isolation, and resource mobilization.
Nurses use these epidemiological concepts to understand disease patterns, educate patients and communities about risks, and implement preventive measures.
What if the CFR of a novel influenza virus is reported to be 10%? This would trigger a high-level emergency response. Nurses would be at the forefront, implementing strict PPE protocols, preparing for a surge in critically ill patients, and participating in mass vaccination campaigns once a vaccine is available.

How to Approach the Question

First, identify the core concept in the question: 'epidemiological measurements' and 'mortality'. The question asks to link a specific measure to death.
Analyze each option's definition. Think about what each term primarily measures.
Point Prevalence: 'Prevalence' relates to how widespread a disease is (morbidity).
DALY: 'Disability-Adjusted' suggests it involves more than just death; it includes illness/disability.
HALE: 'Health-Adjusted' suggests a focus on quality of life, not just its length.
Case Fatality Rate: 'Fatality' directly means death. This term explicitly links cases of a disease to death.

Concept Tested & Keywords

Concept Tested: Identification of epidemiological measurements related to mortality.
Stem keywords: epidemiological measurements, mortality
Lead-in keywords: Which

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) pp. 10-12, 51-53