Meta Analysis: A systematic review that uses quantitative methods to synthesize & summarize results.
Systematic Review: A summary of the medical literature that uses explicit methods to perform a comprehensive literature search & critical appraisal of individual studies & that uses appropriate statistical techniques to combine these valid studies
Randomized Controlled Trial: Participants are randomly allocated into experimental or control groups & are followed over time for the variables/outcomes of interest. Clinicians & laboratory workers may also be blinded to participant groups.
Cohort Study: Identifies participants who currently have a certain condition or receive a particular treatment are followed over time & compared with another group of people who are not affected by the condition.
Case Control Study: Identifies participants who have a certain outcome (cases) & participants without that outcome (controls). Investigators look back over time to see if they had the specific exposure.
Case Report/Case Series: A report on one or more participants with a particular outcome. No control group is involved.
(Adapted from CEBM)