NASA categories of evidence
 | This article relies largely or entirely on a single source. (May 2013) |
NASA Categories of Evidence comprise a matrix or scale denoting the sources of evidence provided in the
expert opinion
.
| Broad "Experimental" Design Type | Silagy & Haines Levels of Evidence[2] | Nasa Categories of Evidence |
|---|---|---|
| Controlled | Ia - randomized trials
|
I - At least one randomized, controlled trial
|
| Ib - At least one randomized trial | ||
| IIa - At least one controlled study without randomization
|
II - At least one controlled study without randomization, including control .
| |
| IIb - At least one other quasi-experimental study | ||
| Observational | III - Non-experimental descriptive studies, e.g. comparative correlation or case studies .
|
III - Non-experimental observations or comparative, correlation, and case or case-series studies. |
| Opinion | IV - Expert committee reports or opinions or clinical experiences of respected authorities. | IV - Expert committee reports or opinions of respected authorities based on clinical experiences, bench research, or "first principles ".
|
References
- ^ NASA Categories of Evidence
- ^ Silagy, C; Haines, A (2001). Evidence Based Practice in Primary Care (PDF) (2nd ed.). London: BMJ Books.
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