Epidemiology of NCDs — MCQs
Which of the following attributes are essential for an ideal screening test?
Based on healthcare utility values and life expectancy, which of the following measures can be calculated? Consider a scenario where the average life expectancy for a woman in Japan is 87 years, and there is an increase in life expectancy due to healthcare advancements.
Which of the following screening methods is primarily used under the National Tuberculosis Elimination Program (NTEP)?
All of the following come under priority of Stroke control programme EXCEPT:
Which of the following is not a component of Physical Quality of Life Index (PQLI)?
What is WHO's global target for the prevention and control of non-communicable diseases by 2025 regarding hypertension reduction?
According to Hill's criteria, which of the following is NOT a criterion for establishing causality in noncommunicable diseases?
Which of the following is primordial prevention for non-communicable diseases?
All of the following are risk factors for atherosclerosis EXCEPT which of the following?
Which of the following conditions does not primarily benefit from secondary level prevention?
Epidemiology of NCDs Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following attributes are essential for an ideal screening test?
- A. Safe
- B. Reliable
- C. Valid
- D. All of the options (Correct Answer)
Explanation: ***All of the options*** - An ideal screening test must possess **all three essential attributes**: safety, reliability, and validity. - **Safe**: Minimizes harm to participants and ensures ethical implementation - **Reliable**: Produces consistent, reproducible results with minimal random error - **Valid**: Accurately measures what it intends to measure (high sensitivity and specificity) - These three attributes work together as fundamental requirements for any effective screening program, ensuring that early detection benefits outweigh potential risks. *Safe (alone)* - While safety is absolutely essential, it is **not sufficient by itself** to make an ideal screening test. - A test that is safe but unreliable or invalid would produce inconsistent or inaccurate results, rendering it ineffective for screening purposes. *Reliable (alone)* - Reliability ensures consistent results, which is crucial, but **reliability alone is insufficient**. - A test can be highly reliable (consistently giving the same result) yet completely invalid if it measures the wrong thing or is unsafe. *Valid (alone)* - Validity is critical for accurate measurement, but **validity alone does not make a test ideal**. - Even a valid test must be safe to protect participants and reliable to ensure consistency across different settings and times.
Question 2: Based on healthcare utility values and life expectancy, which of the following measures can be calculated? Consider a scenario where the average life expectancy for a woman in Japan is 87 years, and there is an increase in life expectancy due to healthcare advancements.
- A. HALE
- B. DALY
- C. DFLE
- D. QALY (Correct Answer)
Explanation: ***QALY*** - **Quality-Adjusted Life Years (QALYs)** combine the length of life with the **quality of life** lived, taking into account healthcare utility values (e.g., from 0 for dead to 1 for perfect health). - An increase in life expectancy due to healthcare advancements, coupled with assumed utility values, directly enables the calculation of QALYs gained or lost. *HALE* - **Health-Adjusted Life Expectancy (HALE)** is a measure of the average number of years that a person can expect to live in "**full health**" by adjusting for years lived in less than full health due to disease or injury. - While it incorporates health status, it specifically focuses on time lived in full health rather than the utility-weighted quality of life over the entire lifespan as QALYs do. *DALY* - **Disability-Adjusted Life Years (DALYs)** measure the total number of healthy years lost due to disease, disability, or premature death. - DALYs are a measure of disease burden, quantifying years lost, whereas QALYs are a measure of health gains or health states. *DFLE* - **Disability-Free Life Expectancy (DFLE)** measures the expected number of years an individual will live without disability. - While it considers the absence of disability, it does not incorporate the concept of "utility values" or varying degrees of health-related quality of life beyond a binary disabled/non-disabled state, as QALYs do.
Question 3: Which of the following screening methods is primarily used under the National Tuberculosis Elimination Program (NTEP)?
- A. Active
- B. Passive (Correct Answer)
- C. Mass
- D. None of the options
Explanation: ***Passive*** - Under the NTEP, **passive screening** involves individuals presenting to health facilities with symptoms suggestive of TB. - This method relies on **patient self-reporting** and healthcare provider suspicion, rather than active outreach. - Passive case finding is the **primary screening strategy** used across the general population in the NTEP framework. *Active* - **Active screening** involves community-based interventions to proactively identify individuals with TB, often in high-risk populations. - While active case finding is crucial for specific vulnerable groups (contacts, HIV patients, etc.), it is **not the primary screening method** under the standard NTEP framework for initial detection across the entire population. *Mass* - **Mass screening** involves testing large numbers of people in the general population, regardless of symptoms, to detect disease. - This is generally **cost-prohibitive** and not routinely implemented as a primary screening strategy for TB by the NTEP due to resource limitations and low yield in the general population. *None of the options* - **Passive screening** is indeed a primary method used under the NTEP, making this option incorrect. - The NTEP heavily relies on individuals seeking care when they experience symptoms, which aligns with the definition of passive case finding.
Question 4: All of the following come under priority of Stroke control programme EXCEPT:
- A. Control of alcoholism (Correct Answer)
- B. Control of smoking
- C. Control of diabetes
- D. Control of hypertension
Explanation: ***Control of alcoholism*** - While **alcoholism** is a health concern, its direct and immediate impact as a primary modifiable risk factor for stroke in large-scale stroke control programs is generally less emphasized compared to other factors. - Stroke control programs typically prioritize risk factors with a more direct and significant impact on stroke incidence and severity, such as hypertension, diabetes, and dyslipidemia. *Control of smoking* - **Smoking** is a major modifiable risk factor for stroke, significantly increasing the risk of both ischemic and hemorrhagic stroke due to its effects on atherosclerosis and clotting. - Quitting smoking is a cornerstone of any stroke prevention strategy, and thus its control is a high priority. *Control of diabetes* - **Diabetes** significantly increases the risk of stroke by promoting atherosclerosis and affecting blood vessel health. - Strict glycemic control is essential in preventing stroke and is a priority in stroke control programs. *Control of hypertension* - **Hypertension** is the most important modifiable risk factor for stroke, contributing to both ischemic and hemorrhagic strokes. - Effective blood pressure management is critical for primary and secondary stroke prevention and is a top priority in stroke control programs.
Question 5: Which of the following is not a component of Physical Quality of Life Index (PQLI)?
- A. Life expectancy at 1 year
- B. Literacy rate
- C. Infant mortality rate
- D. Gross National Product (Correct Answer)
Explanation: ***Correct: Gross National Product*** - **Gross National Product (GNP)** is an economic indicator and is not included in the PQLI. - The PQLI specifically aims to measure well-being using social, not economic, indicators. *Incorrect: Life expectancy at 1 year* - **Life expectancy at 1 year of age** is a core component of the PQLI, reflecting health and living conditions. - It assesses the average number of years a child is expected to live past their first birthday. *Incorrect: Literacy rate* - The **adult literacy rate** is a key component of the PQLI, indicating the level of education and human development. - It measures the percentage of people aged 15 and above who can read and write. *Incorrect: Infant mortality rate* - **Infant mortality rate (IMR)** is another essential component of the PQLI, mirroring the health status of a population. - It represents the number of deaths of infants under one year old per 1,000 live births.
Question 6: What is WHO's global target for the prevention and control of non-communicable diseases by 2025 regarding hypertension reduction?
- A. 25% (Correct Answer)
- B. 35%
- C. 55%
- D. 75%
Explanation: ***25%*** - The World Health Organization (WHO) set a global target to achieve a **25% relative reduction in the prevalence of raised blood pressure** (hypertension) by 2025. - This target is part of the WHO's **Global Action Plan for the Prevention and Control of Non-Communicable Diseases (2013-2025)**, one of nine voluntary global targets aiming to reduce premature mortality from NCDs. - The target allows for flexibility: countries can either achieve the 25% relative reduction or contain the prevalence according to national circumstances. *35%* - A 35% reduction in hypertension prevalence is **not a specific global target** set by the WHO for 2025. - The WHO established standardized targets (including 25% for hypertension) to enable consistent monitoring and comparison across countries. *55%* - A 55% reduction is **significantly higher** than the internationally agreed-upon global target for hypertension reduction by 2025. - Such an aggressive target would be challenging to achieve systematically across diverse healthcare systems worldwide within this timeframe. *75%* - A 75% reduction in hypertension prevalence represents an **unrealistically high goal** for the WHO's 2025 targets. - Global health targets are designed to be ambitious yet attainable, balancing aspiration with feasibility to encourage widespread implementation and measurable progress.
Question 7: According to Hill's criteria, which of the following is NOT a criterion for establishing causality in noncommunicable diseases?
- A. Strength of association
- B. Absence of temporal sequence (Correct Answer)
- C. Dose response relationship
- D. Specificity of association
Explanation: ***Absence of temporal sequence*** - A crucial criterion for establishing causality is the **presence of a temporal sequence**, meaning the exposure must precede the outcome. - The **absence of a temporal sequence** would argue directly against causality, as the cause cannot come after the effect. *Strength of association* - This criterion suggests that a **stronger statistical association** between an exposure and an outcome makes a causal relationship more likely. - A large **relative risk** or **odds ratio** indicates a strong association. *Dose response relationship* - This criterion implies that as the **amount or duration of exposure increases**, the **risk or severity of the outcome also increases**. - This **dose-response gradient** strengthens the argument for a causal link. *Specificity of association* - This criterion suggests that a single exposure leads to a **specific effect**, and not a wide range of unrelated effects. - While helpful, **lack of specificity does not rule out causality**, as many exposures can have multiple effects.
Question 8: Which of the following is primordial prevention for non-communicable diseases?
- A. Salt restriction in high NCD area
- B. Smoking cessation in high NCD area
- C. Preservation of traditional diet in low NCD area (Correct Answer)
- D. Early diagnosis & Treatment
Explanation: ***Preservation of traditional diet in low NCD area*** - **Primordial prevention** targets the underlying causes of disease before risk factors are established, often at a population level. - Preserving a **healthy traditional diet** in an area with low rates of non-communicable diseases (NCDs) prevents the emergence of shared risk factors like processed food consumption and sedentary lifestyles. *Salt restriction in high NCD area* - This is an example of **primary prevention**, as it aims to reduce a specific risk factor (high salt intake) in a population susceptible to NCDs like hypertension. - It intervenes when risk factors are already present or emerging, unlike primordial prevention which aims to prevent their development. *Smoking cessation in high NCD area* - Also a form of **primary prevention**, as it targets an existing modifiable risk factor (smoking) to prevent the onset of NCDs. - It focuses on individuals or groups already exposed to a risk factor rather than preventing the societal conditions that lead to its emergence. *Early diagnosis & Treatment* - This falls under **secondary prevention**, which aims to detect and treat diseases early to halt their progression and prevent complications. - It occurs after the disease has already begun but before significant symptoms or irreversible damage have occurred.
Question 9: All of the following are risk factors for atherosclerosis EXCEPT which of the following?
- A. Hypercholesterolemia
- B. Smoking
- C. Hypertension
- D. Normal LDL cholesterol (Correct Answer)
Explanation: ***Normal LDL cholesterol*** - **Normal LDL cholesterol** levels indicate a healthy lipid profile, which is protective against rather than a risk factor for **atherosclerosis**. - **Low-density lipoprotein (LDL)** is often referred to as "bad cholesterol" because high levels contribute to plaque buildup in arteries [1]. *Hypercholesterolemia* - **Hypercholesterolemia**, particularly elevated **LDL cholesterol**, is a primary independent risk factor for the development and progression of **atherosclerosis** [1]. - Excess cholesterol leads to the formation of **fatty streaks** and **atheromatous plaques** within arterial walls [2]. *Smoking* - **Smoking** severely damages the **endothelium**, making blood vessels more susceptible to plaque formation and promoting **atherosclerosis**. - It also reduces **HDL cholesterol**, increases **oxidative stress**, and promotes **inflammation**, all contributing to arterial damage [1]. *Hypertension* - **Hypertension** (high blood pressure) causes chronic mechanical stress on the arterial walls, leading to **endothelial injury** and dysfunction [3]. - This damage facilitates the infiltration of lipids and inflammatory cells, accelerating the development of **atherosclerotic plaques** [2].
Question 10: Which of the following conditions does not primarily benefit from secondary level prevention?
- A. Coronary heart disease
- B. Leprosy
- C. TB
- D. None of the options (Correct Answer)
Explanation: ***None of the options*** - This is the **correct answer** because all three conditions listed (Coronary heart disease, TB, and Leprosy) DO significantly benefit from **secondary prevention** strategies. - The question uses negation ("does not"), asking which condition does NOT benefit from secondary prevention. - Since all three diseases benefit from secondary prevention, the answer is "None of the options." **Why each condition DOES benefit from secondary prevention:** *Coronary Heart Disease (CHD)* - **Secondary prevention** includes screening for risk factors (hypertension, hyperlipidemia, diabetes), early detection through ECG and cardiac biomarkers, and prompt intervention. - Post-event management with antiplatelets, statins, beta-blockers, and lifestyle modifications prevents recurrence and reduces mortality. - Early detection and treatment of risk factors halt disease progression and prevent complications. *Tuberculosis (TB)* - **Secondary prevention** is crucial through **early case detection** (contact tracing, active case finding, screening high-risk populations) and **prompt initiation of antitubercular therapy**. - Early diagnosis via sputum microscopy, GeneXpert, and chest X-ray prevents disease progression, reduces transmission, and prevents complications like miliary TB or TB meningitis. - Timely treatment ensures cure and prevents development of drug resistance. *Leprosy* - **Secondary prevention** involves **active case detection through surveys** and **prompt multi-drug therapy (MDT)**. - Early diagnosis and treatment prevent irreversible nerve damage, deformities, and disabilities. - Reduces transmission in the community and prevents progression to advanced stages.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free