Intended for healthcare professionals

Research Article

Statistics and ethics in medical research: III How large a sample?

Br Med J 1980; 281 doi: https://doi.org/10.1136/bmj.281.6251.1336 (Published 15 November 1980) Cite this as: Br Med J 1980;281:1336

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Usage statistics: February 2009 to February 2021

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