Table 2 National Health and Medical Research Council (NHMRC) levels of evidence
Level | Intervention Studies |
|---|---|
I | Systematic review of level II studies |
II | Randomised controlled trial |
III-I | Pseudo-randomised controlled trial (i.e. alternate allocation or some other method) |
III-2 | Comparative study with concurrent controls: |
|  | •Non-random, experimental trial |
|  | •Cohort study |
|  | •Case-control study |
|  | •Interrupted time series with a control group |
III-3 | Comparative study without concurrent controls: |
|  | •Historical control study |
|  | •Two or more single arm study |
|  | •Interrupted time series without a parallel control group |
IV | Case series with either post-test or pre-test/post-test outcomes |