Note:

• This power estimation assumes a Type I error (alpha) of 0.05.
• It can be used to check whether the power for an existing meta-analysis result is sufficient (e.g., > 0.8).
• By inputting different numbers of studies with the same effect size and average group sample sizes, you can determine the required minimum number of studies for adequate power.
• If the effect size is expressed as HR, RR, or OR, convert it to a standardized mean difference using these tools.