====== Clinical trial classification ======

There are two main types of [[trial]]s or studies 

===== Interventional study =====

[[Interventional study]].

===== Observational study =====

[[Observational study]]. 
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[[Trial]]s can fall into two broad categories: [[pragmatic clinical trial]]s and [[explanatory trial]]s.


A placebo-controlled trial is a type of clinical trial
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clinicaltrials.gov 

[[cochrane central register of controlled trials]] 

[[International clinical trials registry platform]] 
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The reviewer needs to correlate the type of study selected, whether it be [[observational]] or [[interventional]], with the possibility that it will answer the [[research question]]. The type of study indicates the level or quality of [[evidence]] and the accuracy of the information.

===== Study Classification =====

see [[Study Classification]].