difference between control and pretreatment how does the standard error between treatments work with the difference between a pre-treated group and a control group? how do you calculate the es of a group of studies which data sets are used by the effect size calc? how to find the difference between pre and post placebo how to compare treatment groups difference between pre vs post treatment and placebo what is the difference pre vs post how to compare pre vs post treatment difference between study pre and post difference in pre vs post treatment how to determine the difference between pre and post treatment what program to use for es what is the difference between pre and post treatment how to calculate the difference between control and pre treatment what is the difference of pre- and post-treatment how to get es in meta-analysis of study how to compare pre and post treatment studies difference between pre and post treatment what is the difference between pre and post treatment