A systematic review that uses quantitative methods to synthesize and summarize the results.
A summary of the medical literature that uses explicit methods to perform a comprehensive literature search and critical appraisal of individual studies and that uses appropriate statistical techniques to combine these valid studies.
Randomized Controlled Trial
Participants are randomly allocated into an experimental group or a control group and followed over time for the variables/outcomes of interest.
Involves identification of two groups (cohorts) of patients, one which received the exposure of interest, and one which did not, and following these cohorts forward for the outcome of interest.
The observation of a defined population at a single point in time or time interval. Exposure and outcome are determined simultaneously.
A study which involves identifying patients who have the outcome of interest (cases) and patients without the same outcome (controls), and looking back to see if they had the exposure of interest.
A report on a series of patients with an outcome of interest. No control group is involved.
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