| Level | Source of Evidence |
|---|---|
| Ia | Evidence obtained from meta-analysis or systematic reviews of randomized controlled trials, 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 studies, descriptive studies, and/or qualitative research. |
| V | Evidence obtained from expert opinion, committee reports, and/or clinical experiences of respected authorities. |
Healthy Work Environment
Adopting eHealth Solutions: Implementing Strategies
Practice Recommendations