Semester 3 Practice Questions In Epidemiology

8 Questions | Total Attempts: 4883

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Semester 3 Practice Questions In Epidemiology

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Questions and Answers
  • 1. 
    An outbreak of gastritis occurred on a cruise ship.  The data in the following table were obtained shortly after the outbreak, from a questionnaire completed by everyone on board the ship. What is the relative risk of developing gastritis from herring consumption?
    • A. 

      0.5

    • B. 

      2.0

    • C. 

      2.3

    • D. 

      8.0

    • E. 

      1.0

  • 2. 
    In a study of 500 cases of a disease and 500 controls, the suspected etiological factor is found in 400 cases and 100 controls.  What is the absolute risk of disease in people with the factor?
    • A. 

      80%

    • B. 

      40%

    • C. 

      16%

    • D. 

      20%

    • E. 

      Cannot be computed from the data given

  • 3. 
    Regionville is a community of 100,000 persons.  During 1985 there were 1,000 deaths from all causes.  All cases of tuberculosis have been found and they total 300 – 200 males and 100 females.  During 1985, there were 60 deaths from tuberculosis, 50 of them males. What is the crude mortality rate for Regionville?
    • A. 

      300 per 100,000

    • B. 

      60 per 1,000

    • C. 

      10 per 1,000

    • D. 

      100 per 1,000

    • E. 

      200 per 1,000

  • 4. 
    In 1945, there were 1,000 women who worked in a factory painting radium dials on watches.  The incidence of bone cancer in these women up to 1975 was compared to that of 1,000 women who worked as telephone operators in 1945.  Twenty of the radium dial painters and four of the telephone operators developed bone cancer between 1945 and 1975.  What study design is this?
    • A. 

      Cohort study

    • B. 

      Experimental study

    • C. 

      Clinical trial

    • D. 

      Cross-sectional study

    • E. 

      Case-control study

  • 5. 
    Researchers set out to demonstrate that a new drug is more effective in lowering systolic blood pressure than beta-blockers.  They select two groups from among a number of previously uncontrolled hypertensive patients to receive either the new drug or a beta-blocker using a computer programme to make the allocation purely by chance.  What is this method of assignment called?
    • A. 

      Random selection

    • B. 

      Randomization

    • C. 

      Blinding

    • D. 

      Cross-over

    • E. 

      Factorial

  • 6. 
    A screening test for breast cancer was administered to 400 women with biopsy-proven breast cancer and to 400 women without breast cancer.  The test results were positive for 100 of the proven cases and 50 of the normal women. What is the sensitivity of this screening test?
    • A. 

      88%

    • B. 

      67%

    • C. 

      25%

    • D. 

      33%

    • E. 

      12%

  • 7. 
    A 25 year old male patient presents to you with a purulent urethral discharge for one day. He admits to having had unprotected sex 3 nights ago and has had no other sexual contact in the past year.  In order to initiate empirical treatment while awaiting laboratory tests for this sexually transmitted illness in this patient what other period do you need to know?
    • A. 

      Period of exposure

    • B. 

      Incubation period

    • C. 

      Infectious period

    • D. 

      Latent period

    • E. 

      Serial interval

  • 8. 
    Researchers investigated the relationship between the use of statins and prostate cancer mortality by examining the records of patients who died from prostate cancer as well as records of matched controls. They report an unadjusted odds ratio of 0.49 (95% confidence interval, 0.34-0.70), which decreased to 0.37 (P<0.0001), after adjusting for education, waist size, body mass index, comorbidities and anti-hypertensive medication.  What can you conclude from these results?
    • A. 

      Statins significantly lower the risk of death from prostate cancer

    • B. 

      Statins have no effect on cancer mortality

    • C. 

      Comorbidities have no effect on prostate cancer mortality

    • D. 

      This was an ecological study

    • E. 

      The sample size was too inadequate

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