Levels of Evidence:
LEVEL | SOURCE OF EVIDENCE |
---|---|
Ia | Evidence obtained from meta-analysisG or systematic reviews of randomized controlled trialsG, and/or synthesis of multiple studies primarily of quantitative research. |
Ib | Evidence obtained from at least one randomized controlled trial. |
IIa | Evidence obtained from at least one well-designed controlled study without randomization. |
IIb | Evidence obtained from at least one other type of well-designed quasi-experimental study, without randomization. |
III | Synthesis of multiple studies primarily of qualitative research. |
IV | Evidence obtained from well-designed non-experimental observational studies, such as analytical studiesG or descriptive studies, and/or qualitative studies. |
V | Evidence obtained from expert opinion or committee reports, and/or clinical experiences of respected authorities. |
Addiction and Mental Health
Crisis Intervention
Practice Recommendations