As shown in the title, I am doing the meta-analysis, however, I only know the information about weight mean difference and its 95% CI, how can I draw the forest plots?
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The user-written metan command and the official (Stata v16+) meta command suite both have capabilities to perform meta-analyses and create forest plots based on effect sizes and 95% confidence limits. Because the individual group means and SDs are not known, this data format is known as "generic" -- that is, it does not matter whether the values represent weighted mean differences, risk differences, log odds ratios, or whatever; they will be analysed in the same way. Therefore, you may need to give an explicit title making it clear that the values represent weighted mean differences.
For metan, first ensure that you have the latest version (v4.06 12oct2022) from the SSC archive. Then type help metan; the section on use of 95% confidence limits is near the top. For meta, assuming you have Stata 16 or 17 installed, type help meta set. Again, the section on use of 95% confidence limits is near the top. Note also the option civartolerance(#); this will help to check that your recorded values for the confidence limits are compatible with each other and with the point estimate (i.e. that the interval is symmetric).
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