|
 |
 Levels of evidence
| I |
Evidence obtained from a systematic review of all relevant
randomised controlled trials |
| II |
Evidence obtained from at least one properly designed randomised
controlled trial |
| III-1 |
Evidence obtained from well-designed pseudo-randomised controlled
trials (alternate allocation or some other method) |
| III-2 |
Evidence obtained from comparative studies with concurrent controls
and allocation not randomised (cohort studies), case-control studies, or
interrupted time series with a control group |
| III-3 |
Evidence obtained from comparative studies with historical control,
two or more single-arm studies, or interrupted time series without a
parallel control group |
| IV |
Evidence obtained from case series, either post-test or pre-test and
post-test |
These levels of evidence ratings have been adapted from US Preventive
Services Task Force (1989) Guide to clinical preventive services: an assessment
of the effectiveness of 169 interventions (ed M Fisher), Williams and Williams,
Baltimore, Appendix A, p 388.
Source: NHMRC
A guide to the development, implementation and evaluation of clinical practice
guidelines.
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