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Target and actual sample sizes for studies from two trial registries from 1999 to 2020: an observational study
OBJECTIVES: To investigate differences between target and actual sample sizes, and what study characteristics were associated with sample sizes. DESIGN: Observational study. SETTING: The large trial registries of clinicaltrials.gov (starting in 1999) and ANZCTR (starting in 2005) through to 2021. PA...
| Autores principales: | , |
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| Formato: | Online Artículo Texto |
| Lenguaje: | English |
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BMJ Publishing Group
2021
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| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8719224/ http://dx.doi.org/10.1136/bmjopen-2021-053377 |