| PMC full text: | Published online 2010 Jun 2. doi: 10.1186/1746-1340-18-13
|
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 |
NB. Adapted from NHMRC Levels of evidence [58]