Pooled Standard Deviation from Confidence Interval

Computes the implied pooled within-group SD under the equal outcome SD assumption for the two groups from a CI around a raw mean difference from two independent groups. The output is not the SD of the effect. This method is valid only if the confidence interval is symmetric around the raw mean difference and if either the t distribution or normal distribution (when t_dist = FALSE ) was used to calculate the confidence interval.

Lower limit confidence interval
Upper limit confidence interval
Sample size group 1
Sample size group 2
Significance level
Whether a two sided test for significance was used
Whether a t distribution has been used to calculate the CI
Within Study Result

Result

Function References

Cochrane Handbook

How to Cite

Emprechtinger, R., Schwarzer, G., Tölch, U., Schreder, G., & Gartlehner, G. (2025). Assessing the effectiveness of metaHelper: A randomized controlled trial of a web application and R package to streamline statistical transformations in meta-analysis. Journal of Clinical Epidemiology, 179, 111640. https://doi.org/10.1016/j.jclinepi.2024.111640

Download Citation (.ris) | View Source (JCE)