Pooled Standard Deviation from Confidence Interval

Computes the pooled standard deviation (e.g., standard deviation of an intervention effect) from confidence intervals and sample sizes. According to the Cochrane Handbook (see references), this standard deviation is referred to as the "within-group standard deviation." This method is valid only if the confidence interval is symmetrical around the mean 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

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