The different types of studies

Many types of clinical studies exist :

Yes, there are many exemples again, but it's interesting, I swear !

Case presentation : an isolated case interesting for its rarity or a particular reaction

This one could show funny deseaeses !

Case series : Retrospective study based on the analysis of clinical cases, no comparison with controls

For sure this one could be boring, but it depends on the case

Case-control study : a retrospective study between two groups, one with a disease (cases) and the other free (controls)

Cohort study : comparison between a group of subjects exposed to a risk, versus an unexposed group

Controlled randomized trials: comparison between two randomized groups, one receiving the treatment studied, the other a placebo or a standard treatment

These are the trials which are the most used

Meta-analysis: recovery of a set of comparable studies and global analysis using statistical tools

These are the Rolls Royce of the trials !