Many articles have given me pre and post Mean and SD, however, they have not given me the mean change or mean SD change. From my understanding, it is the latter that I need to undertake a MA. With only means and SD from pre and post how can I calculate the mean SD. Many thanks in advance
Hi Ellen Calteau , your suggestion (take SD pre and post and divide by 2) will not properly estimate the mean change SD you are looking for.
I have encountered the same problem before and the Cochrane Handbook for Systematic Reviews of Interventions gave great guidance to get around this. Please check this reference from the Cochrane Handbook version 5.1 (there is an updated version, but the content still holds): https://handbook-5-1.cochrane.org/chapter_16/16_1_3_2_imputing_standard_deviations_for_changes_from_baseline.htm.
Aedrian Abrilla thank you so much for your response. I had read this but I was hoping I was wrong. Or hoping there was another way
Check..
Article Dealing with missing standard deviation and mean values in m...
I have answered this question here: https://www.vehjir.com/2023/01/can-i-take-sd-pre-and-post-and-divide.html
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