I am performing a Meta-Analysis about a mental disease, comparing intervention vs. control groups and try to extract outcome results from published study papers.
In some clinical randomised trials the results for the main outcome, continuous in this example, are given only as "adjusted difference in mean scores" e.g. "-8,9" as well as the Confidence Interval 95% start and end and the hint that the results come from "repeated measure analysis of covariance, adjusting for baseline and clinic center with random effect model. Comparing an intervention with a control group.
- Is this the effect size of the intervention?
- What information can be extracted from the change scores?
- Is it possible to calculate the Mean Difference (MD) and Standard Deviation (SD) for BOTH groups (intervention & control) from this given "change score"?
(In my case the answer to the 3. question part is needed to produce forest plots in the software RevMan.)