PUB-540-O500 Principles of Epidemiology Exam Answers

PUB-540-O500 Principles of Epidemiology Exam Answers

PUB-540-O500 Principles of Epidemiology Exam Answers

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PUB-540-O500 – Principles of Ep…

NITSELL MEDINA

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Course Materials

Topic 1: Overview of Epidemiology

Topic 2: Disease Surveillance and Measurement

Topic 3: Causal Inference, Confounding, and Bias

Topic 4: Study Designs I

Topic 5: Study Designs II

Topic 6: Measures of Association and Application

Topic 7: Applying Epidemiology to Policy

Topic 8: Environment and Genetics

Study Materials

Tasks

Topic 8 DQ 1

 

Topic 8 DQ 2

Final Exam

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1

Based on a total population of 10,000, with 2,500 of those being children under 18 years, what is the prevalence of adult (18 or older) onset asthma in 2012? The total number of adult onset asthma cases in 2012 was 475.

 

0.40%

 

 

4.75%

 

 

6.33%

 

 

19.0%

 

 

None of the above

 

 

Question Points: 5.0 / 5.0

 

2

Multiple outcomes can be investigated in a cohort study.

True  False

Question Points: 5.0 / 5.0

 

3

A randomized trial establishes the strongest causal evidence when appropriate.

True  False

Question Points: 5.0 / 5.0

 

4

Cross-sectional studies are time consuming and expensive.

True  False

Question Points: 5.0 / 5.0

 

5

What is the age adjusted mortality rate for Community B? Use the direct adjustment method using the total of both communities as the standard population. PUB-540-O500 Principles of Epidemiology Exam Answers

 

 

 

7.5/1,000 people

 

 

11/1,000 people

 

 

13.9/1,000 people

 

 

19/1,000 people

 

 

None of the above

 

 

Question Points: 0.0 / 5.0

 

6

Multiple exposures can be investigated in a case-control study.

True  False

Question Points: 5.0 / 5.0

 

7

Based on a population of 10,000, with 2,500 of those being children under 18 years, what is the incidence of adult onset asthma in 2013 assuming no change in the population? The total number of adult onset asthma cases in 2012 was 475 and the number of new cases in 2013 was 40.

 

40 per 10,000 person years

 

 

53 per 10,000 person years

 

 

57 per 10,000 person years

 

 

160 per 10,000 person years

 

 

None of the above

 

 

Question Points: 0.0 / 5.0

 

8

Based on the following information, what is the negative predictive value?

True positives = 25

False positives = 5

True negatives = 55

False negatives = 15

 

27.8%

 

 

83.3%

 

 

91.7%

 

 

68.75%

 

 

78.57%

 

 

Question Points: 5.0 / 5.0

 

9

Based on the following information, what is the specificity?

True positives = 25

False positives = 5

True negatives = 55

False negatives = 15

 

62.5%

 

 

83.33%

 

 

91.67%

 

 

68.75%

 

 

78.57%

 

 

Question Points: 5.0 / 5.0

 

10

A cohort study of physical activity and coronary heart disease was conducted in a rural community. The incidence of heart disease was 18.1 per 1,000 person-years among those with sedentary lifestyles and 9.1 per 1,000 person-years among those with active lifestyles. We know that 35% of this population lived sedentary lifestyles. What is the proportion of risk in the total population attributable to a sedentary lifestyle?

 

49.7%

 

 

17.4%

 

 

  1. 8%

 

 

25.7%

 

 

None of the above

 

 

Question Points: 0.0 / 5.0

 

11

A relative risk can be calculated from a case-control study.

True  False

Question Points: 0.0 / 5.0

 

12

The study design in which disease and exposure rates are compared using a large group or country as the unit of analysis in order to draw conclusions about individuals, is which of the following?

 

Randomized controlled trial

 

 

Cohort

 

 

Case-control

 

 

Cross-sectional

 

 

Ecological

 

 

Question Points: 5.0 / 5.0

 

13

The study design in which study participants are randomly selected into the treatment group or control group in order to balance known and unknown characteristics between the groups, is which of the following?

 

Randomized controlled trial

 

 

Cohort

 

 

Case-control

 

 

Cross-sectional

 

 

Ecological

 

 

Question Points: 5.0 / 5.0

 

14

The study design in which individual outcome and exposure status are assessed at the same time, is which of the following?

 

Randomized controlled trial

 

 

Cohort

 

 

Case-control

 

 

Cross-sectional

 

 

Ecological

 

 

Question Points: 5.0 / 5.0

 

15

An odds ratio is a good estimate of the relative risk when the disease is common.

True  False

Question Points: 5.0 / 5.0

 

16

The study design in which individuals with and without the disease are selected in order to determine if the odds of disease is associated with previous exposures, is which of the following?

 

Randomized controlled trial

 

 

Cohort

 

 

Case-control

 

 

Cross-sectional

 

 

Ecological

 

 

Question Points: 0.0 / 5.0

 

17

What is the standardized mortality ratio (SMR) for disease Z in Population A given the following information:

 

 

 

SMR = 130

 

 

SMR = 226

 

 

SMR = 442

 

 

SMR = 565

 

 

None of the above

 

 

Question Points: 5.0 / 5.0

 

18

Based on the following information, what is the positive predictive value?

True positives = 25

False positives = 5

True negatives = 55

False negatives = 15

 

62.5%

 

 

27.8%

 

 

83.3%

 

 

91.7%

 

 

78.57%

 

 

Question Points: 5.0 / 5.0

 

19

The study design in which study participants are selected prior to developing the disease and studied over a specified period of time to determine if preselected exposures are associated with the development of disease, is which of the following?

 

Randomized controlled trial

 

 

Cohort

 

 

Case-control

 

 

Cross-sectional

 

 

Ecological

 

 

Question Points: 0.0 / 5.0

 

20

Based on the following information, what is the sensitivity?

True positives = 25

False positives = 5

True negatives = 55

False negatives = 15

 

62.5%

 

 

31.3%

 

 

83.3%

 

 

68.75%

 

 

78.57%

 

 

Question Points: 5.0 / 5.0

 

 

Total Questions

20

 

Answered Questions

20