| 释义 |
- References
{{Multiple issues|{{external links|date=May 2013}}{{one source|date=May 2013}}
}}NASA Categories of Evidence comprise a matrix or scale denoting the sources of evidence provided in the Human Research Program's various evidence reports, and thus potentially their probative value and efficacy.[1] Authors in the Program were urged to label their evidence according to whether it was based on controlled experiments, observation, or expert opinion. >| Broad "Experimental" Design Type | Silagy & Haines Lelvels of Evidence[2] | Nasa Categories of Evidence | | Controlled | Ia - Meta-analysis of 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 cohort, case-control, or subject operating as own 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". | |
References1. ^NASA Categories of Evidence
2. ^{{cite book|last=Silagy|first=C|title=Evidence Based Practice in Primary Care |edition=2nd |date=2001|publisher=BMJ Books|location=London|url=http://die-serie.com/Books/Evidence_Based_Practice_in_Primary_Care.pdf|author2=Haines, A}}
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