Advances in Urology / 2015 / Article / Tab 5

Review Article

A Narrative Review on the Pathophysiology and Management for Radiation Cystitis

Table 5

Levels of evidence [27].

Level of evidenceType of evidence

1aSystematic review (with homogeneity) of randomised control trials

1bIndividual randomised control trials (with narrow confidence intervals)

1cAll or none randomised control trials

2aSystematic review (with homogeneity) of cohort studies

2bIndividual cohort study or low quality randomised control trials

2cOutcomes research

3aSystematic review (with homogeneity) of case-control studies

3bIndividual case-control study

4Case series (and poor quality cohort and case-control studies)

5Expert opinion

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