Randomised Controlled Study:

Question 1

Descriptive or analytic?

Answer 1

Analytical

Question 2

Observational or interventional?

Answer 2

Interventional

Question 3

What it is used to measure:

Answer 3

Participants are randomly allocated to groups. Always have a comparison (control) group. Testing effect of treatments/interventions

Question 4

Strengths:

Answer 4

Best way to evaluate on an intervention

Strongest design for demonstrating a casual association

Best way of testing interventions

Question 5

Limitations:

Answer 5

Loss to follow up

Blinding is difficult to achieve and may be obvious or cause safety concerns

Non-adherence can cause bias

Ethical issues

Need clinical equipoise

Resource intensive

Exposure needs to be modifiable

Higher selectivity not relating to real world.

Question 6

Measure of Occurrence:

Answer 6

Incidence risk
Incidence proportion

Question 7

Measure of association:

Answer 7

Relative Risk
Risk Difference