Research Article Confidence intervals and sample sizes: don't throw out all your old sample size tables. British Medical Journal 1991; 302 doi: https://doi.org/10.1136/bmj.302.6772.333 (Published 09 February 1991) Cite this as: British Medical Journal 1991;302:333 Article Related content Metrics Responses Peer review Related articles Letter Confidence intervals and sample sizes. Published: 13 April 1991; British Medical Journal 302 doi:10.1136/bmj.302.6781.907-b Cited by... Estimating sample sizes for binary, ordered categorical, and continuous outcomes in two group comparisonsFulltext