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Pragmatic controlled clinical trials in primary care: the struggle between external and internal validity
BACKGROUND: Controlled clinical trials of health care interventions are either explanatory or pragmatic. Explanatory trials test whether an intervention is efficacious; that is, whether it can have a beneficial effect in an ideal situation. Pragmatic trials measure effectiveness; they measure the de...
Autores principales: | , , , , , , , |
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Formato: | Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2003
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC317298/ https://www.ncbi.nlm.nih.gov/pubmed/14690550 http://dx.doi.org/10.1186/1471-2288-3-28 |