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Ranking of evidence by study type

Ranking of evidence by study type 
 T1 Randomised control trial (RCT)
 T2 Controlled trial (CT)
 T3 Controlled before-and-after intervention study (CBA)
 O1 Cohort study / longitudinal study
 O2 Case-control study
 O3 Cross-sectional
 O4 Study using qualitative methods only
 O5 Case series
 O6 Case study
 X Formal consensus or other professional (expert) opinion (automatic exclusion)

 

 

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