Biostatistics & Epidemiology — Practice

Question 1

A new drug prevents death from a chronic incurable disease. What happens to its incidence and prevalence?

Accepted Answer

B

Question 2

Which property of a test changes when it is applied to a population with lower disease prevalence?

Accepted Answer

C

Question 3

Which design is most appropriate for studying a rare occupational exposure with several possible outcomes?

Accepted Answer

A

Question 4

In a cohort study, incidence is 20 per 1000 in the exposed and 5 per 1000 in the unexposed. What is the attributable risk percent?

Accepted Answer

B

Question 5

A study finds an association between coffee drinking and lung cancer, but coffee drinkers smoke more. What is smoking here?

Accepted Answer

B

Question 6

Why does the odds ratio overestimate the relative risk when a disease is common?

Accepted Answer

B

Question 7

A screening programme reports improved five-year survival with no change in disease-specific mortality. What is the most likely explanation?

Accepted Answer

B

Question 8

A trial reports a relative risk of 0.78 with a 95 per cent confidence interval of 0.61 to 0.99. What can be concluded?

Accepted Answer

B

Question 9

Why does tetanus show no herd immunity despite an effective vaccine?

Accepted Answer

B

Practice — Biostatistics & Epidemiology