Table 2. National Health and Medical Research Council Hierarchy of Evidence [27].
Level | Definition |
---|---|
I | A systematic review of level II studies. |
II | A randomised controlled trial. |
III-1 | A pseudorandomised controlled trial (alternate allocation or some other method). |
III-2 | A comparative study with concurrent controls (non-randomised experimental trial, cohort study, case-control study or interrupted time series with a control group). |
III-3 | A comparative study without concurrent controls (historical control study, two or more single arm study or interrupted time series without a parallel control group). |
IV | Case series with either post-test or pre-test/post-test outcomes. |