Cuestionario: Introduction to Epidemiology — 10 preguntas

1. What is the term for the number of new cases of a disease that develop in a specific population during a defined time period?

A. Mortality rate

B. Incidence

C. Prevalence

D. Risk factor

Answer: (B)

Explicación

The correct answer is 'Incidence,' which refers to the number of new cases of a disease that develop in a specified population during a specific time period. It measures the risk of developing the disease. Prevalence measures all existing cases at a point or period, mortality rate measures deaths, and risk factor refers to attributes increasing disease likelihood.

2. What is the primary purpose of epidemiology as a science?

A. To identify disease patterns and determinants for prevention and control

B. To develop new medications for diseases

C. To provide individual patient care and diagnosis

D. To study genetic mutations in diseases

Answer: (A)

Explicación

Epidemiology focuses on understanding disease patterns and determinants within populations, which informs prevention and control strategies. It is not primarily concerned with individual treatment or genetic research.

3. Which of the following disease frequency measures is calculated by dividing the total number of deaths in a population during a specific period by the total population, often expressed per 1,000 or 100,000 individuals?

A. Incidence rate

B. Prevalence

C. Crude mortality rate

D. Years of Potential Life Lost (YPLL)

Answer: (C)

Explicación

The correct answer is 'Crude mortality rate,' which is calculated by dividing the total number of deaths in a population during a specific period by the total population, and is often expressed per 1,000 or 100,000 individuals. The other options refer to different measures: 'Incidence rate' measures new cases, 'Prevalence' measures total cases, and 'YPLL' measures premature mortality.

4. Which of the following best describes the difference between incidence and prevalence?

A. Incidence measures new cases; prevalence measures total cases at a point in time

B. Incidence measures disease burden; prevalence measures risk of developing disease

C. Incidence is always higher than prevalence; prevalence is always lower

D. Incidence and prevalence are interchangeable in epidemiology

Answer: (A)

Explicación

Incidence counts new cases over a period, reflecting risk, while prevalence includes all existing cases at a specific time, reflecting disease burden.

5. What is the primary role or purpose of study designs in epidemiological research?

A. To randomly assign participants to different treatment groups.

B. To systematically investigate health-related questions by determining how data are collected and analyzed.

C. To evaluate the effectiveness of public health interventions through experimental methods.

D. To describe the distribution of diseases in populations without testing hypotheses.

Answer: (B)

Explicación

The primary role of study designs is to systematically investigate health-related questions by determining how data are collected and analyzed. This systematic approach ensures that research findings are valid, reliable, and applicable, enabling researchers to understand disease etiology, distribution, and control measures effectively.

6. Who is credited with establishing epidemiology as a formal science in the 19th century?

A. John Snow

B. Louis Pasteur

C. Robert Koch

D. Florence Nightingale

Answer: (A)

Explicación

John Snow is considered a founding figure in epidemiology, notably for his work on cholera transmission in the 1850s.

7. What is a key characteristic of a cohort study in epidemiology?

A. It follows a group over time to assess disease development

B. It compares cases with controls to identify risk factors

C. It collects data at a single point in time to assess disease prevalence

D. It randomly assigns exposures to determine causality

Answer: (A)

Explicación

Cohort studies involve following a group over time to see who develops the disease, allowing assessment of temporal relationships between exposure and outcome.

8. Which measure quantifies the strength of association between an exposure and disease in cohort studies?

A. Risk Ratio (Relative Risk)

B. Odds Ratio

C. Prevalence Ratio

D. Case-Fatality Rate

Answer: (A)

Explicación

Risk Ratio, also called Relative Risk, compares the risk of disease between exposed and unexposed groups, common in cohort studies. Odds Ratio is used mainly in case-control studies.

9. What are the systematic steps involved in an outbreak investigation?

A. Verify, describe, hypothesize, test, and control

B. Identify cases, treat patients, publish findings, monitor outcomes

C. Collect samples, conduct laboratory tests, publish results, eradicate disease

D. Survey population, develop vaccine, implement vaccination, evaluate effectiveness

Answer: (A)

Explicación

A systematic outbreak investigation includes verifying the outbreak, describing cases, generating hypotheses, testing them, and implementing control measures.

10. Which of the following is an example of tertiary prevention in public health?

A. Rehabilitation after a stroke

B. Vaccinating children against measles

C. Screening for high blood pressure

D. Health education about smoking cessation

Answer: (A)

Explicación

Tertiary prevention aims to reduce disability and facilitate rehabilitation after disease has occurred, such as stroke rehabilitation.