AMC MCQ Population Health and Epidemiology 3

Question 1

Lead-time bias most commonly causes screening programs to falsely appear to:

Accepted Answer

Improve survival time

Answer

Earlier detection lengthens the apparent survival from diagnosis without changing the actual time of death.

Question 2

A relative risk of 1.0 with a 95% confidence interval of 0.85 to 1.18 indicates the association is:

Accepted Answer

Not statistically significant

Answer

A confidence interval crossing 1.0 means the result is not statistically significant.

Question 3

Which of the following is a notifiable disease that doctors in Australia are legally required to report to public health authorities?

Accepted Answer

Tuberculosis

Answer

Tuberculosis is a nationally notifiable communicable disease requiring mandatory reporting.

Question 4

The incidence of a disease is 5 new cases per 1000 person-years and the average duration is 4 years. What is the approximate prevalence?

Accepted Answer

About 20 per 1000

Answer

Prevalence approximately equals incidence multiplied by duration, giving 5 × 4 = 20 per 1000.

Question 5

Which bias arises when cases recall past exposures more thoroughly than controls in a case-control study?

Accepted Answer

Recall bias

Answer

Recall bias occurs because people with disease often remember exposures differently than healthy controls.

AMC MCQ Practice Test