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Ranking of evidence by study type

T1

Randomised controlled trial (RCT)

T2

Controlled trial (CT) / Quasi-experimental study

T3

Controlled before-and-after intervention study

 

 

O1

Case-control study

O2

Cross-sectional

O2

Interrupted time series

O3

Uncontrolled before and after

O3

Prospective cohort / longitudinal study

O4

Uncontrolled retrospective cohort study

 

 

O5

Case series

O6

Case study

 

 

D1

Diagnostic study

 

 

X

Formal consensus, review or other professional (expert) opinion (automatic exclusion)

 

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