• Explain what is meant by the evidence pyramid

it is this pyramid which denotes the importance and reliability of each type of clinical trial the best being at the top and decreasing with each step

• Describe the main types of research studies employed in medical research
• Observational studies

–Case control

–Cohort

–Cross sectional studies

• Experimental studies

–Randomised and non-randomised trials

Case control

• Describe the advantages and disadvantages of the main study designs