Hi! We are trying to make a meta-analysis on the cognitive effect of probiotics, in most of the articles the data has been obtained or calculated without problem.

However, in the following article: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6412773/pdf/nutrients-11-00305.pdf

The data is expressed in z score (SD), in the variable Domain composite score (Table 2). So we do not know how to calculate the mean of each group.

Could someone help us, thanks in advance