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Ranking of evidence by study type

Ranking of evidence by study type
T1 Randomised controlled 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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