Q: Which of the following is a correct formula for calculating incidence rate in a population?

$$Incidence\ Rate = \frac{\text{Number\ of\ new\ cases\ during\ a\ specified\ time}}{\text{Population\ at\ risk\ during\ the\ same\ time}}$$

Question 1

According to the World Health Organization (1948), which of the following best defines health?

Accepted Answer

Health is a state of complete physical, mental, and social well-being and not merely the absence of disease and infirmity.

Question 2

Which of the following is an example of a primary prevention strategy?

Accepted Answer

Providing folic acid supplements to women before pregnancy to prevent neural tube defects.

Question 3

A researcher is interested in the number of new cases of influenza in a city during January. Which epidemiological measure should be used?

Accepted Answer

Incidence

Question 4

Which of the following best describes pathogenesis?

Accepted Answer

The manner of development of a disease process from initial contact to ultimate expression.

Question 5

A diagnostic test for a disease has a sensitivity of 90% and a specificity of 80%. What does the sensitivity value indicate?

Accepted Answer

The test correctly identifies 90% of people with the disease.

Question 6

Which of the following is NOT considered an etiologic factor in disease causation?

Accepted Answer

Socioeconomic status

Question 7

A patient is diagnosed with chronic hepatitis C. Information about the natural history of this disease is important because:

Accepted Answer

It provides directions for preventive measures and screening strategies.

Question 8

Which of the following best describes the concept of reliability in disease diagnosis?

Accepted Answer

The extent to which an observation, when repeated, gives the same result.

Question 9

A community health program aims to reduce complications in patients who have already suffered a heart attack. Which level of prevention does this represent?

Accepted Answer

Tertiary prevention

Question 10

Which factor is LEAST likely to affect an individual's adaptation to stressors?

Accepted Answer

Blood type

Question 11

A test for a disease has a positive predictive value of 95%. What does this mean?

Accepted Answer

95% of people who test positive actually have the disease.

Question 12

Which of the following is an example of secondary prevention?

Accepted Answer

Screening for breast cancer using mammography.

Question 13

Which statement about evidence-based practice is correct?

Accepted Answer

It uses current best evidence to make decisions about patient care.

Question 14

If a population has 200 existing cases of diabetes at a given point in time, which epidemiological term best describes this measure?

Accepted Answer

Prevalence

Question 15

Which of the following is a source of information for epidemiologists that describes the effects an illness has on a person's life?

Accepted Answer

Morbidity

Question 16

A new diagnostic tool is being evaluated. It consistently gives the same result when used by different clinicians on the same patient. This tool is said to have high:

Accepted Answer

Reliability

Question 17

Which aspect of the disease process involves gross anatomic or microscopic changes characteristic of a disease?

Accepted Answer

Morphologic changes

Question 18

A hospital administrator is planning for future resource needs based on the expected number of new cases of a disease next year. Which epidemiologic concept is most relevant?

Accepted Answer

Incidence

Question 19

Which of the following is a correct formula for calculating incidence rate in a population?

Accepted Answer

$$Incidence\ Rate = \frac{	ext{Number\ of\ new\ cases\ during\ a\ specified\ time}}{	ext{Population\ at\ risk\ during\ the\ same\ time}}$$

Question 20

Which of the following is an example of how epidemiologic methods are used in public health?

Accepted Answer

To evaluate the impact of new preventive strategies on disease spread.

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