|
Hierarchy of strength of evidence for therapeutic decisions [slightly modified after [14]] |
|
| Level |
Description |
|
|
|
| I |
Systematic review of randomized controlled trials (RCTs) |
| II |
Article about an RCT |
| III |
Article about an experimental study without randomization; cohort study; case-control-study |
| IV |
Article about a non-experimental study (cross-sectional study; case series; case report) |
| V |
Narrative review or expert opinion (based on clinical experience) without explicit clinical appraisal (e.g., statements, editorials; expert commentaries to published articles; interviews with experts, brief references to NTI-tss in articles; commercial-like reviews) |
Stapelmann and Türp BMC Oral Health 2008 8:22 doi:10.1186/1472-6831-8-22 |
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