Filtered resources appraise the quality of studies and often make recommendations for practice.
Authors of critically-appraised topics evaluate and synthesize multiple research studies.
Authors of critically-appraised individual articles evaluate and synopsize individual research studies.
Authors of a systematic review ask a specific clinical question, perform a comprehensive literature search, eliminate the poorly done studies and attempt to make practice recommendations based on the well-done studies.
A meta-analysis is a systematic review that combines all the results of all the studies into a single statistical analysis of results.