Randomized Controlled Trial:
Controlled Clinical Trial:
Case control study:
Definitions are edited, but sourced from the British Medical Journal's Clinical Evidence Glossary, unless otherwise specified.
Hierarchy of Evidence
Haidich A. B. (2010). Meta-analysis in medical research. Hippokratia, 14(Suppl 1), 29–37.
Critically Appraised Topics (CATs) briefly summarize the evidence for a clinical question. Use these tools to help appraise your topic: