My study aims to synthesise data on the mean age of participants when they were diagnosed with hearing loss, and I wanted to conduct a meta-analysis to obtain the meta-analysed mean age of identification with SD... I have obtained data from 12 studies that met the inclusion criteria and am now stuck at how to compute meta-analysis.
If the studies are case-control studies and each study has mean age, standard deviation and total number of participants for each arm.. you can apply standard mean diference meta analysis.
But if you have single group studies with situation you mentioned, I do not know any type of meta analysis match this case.
You can simple present the results as a narrative synthesis approach and you can summarize and interpret findings from individual studies without statistical pooling.
The Cochrane method is in the attached:
https://handbook-5-1.cochrane.org/chapter_7/7_7_3_8_combining_groups.htm
If it's your first time on meta-analysis and that you don't have any specific background on statistics I would strongly advise you to consult with a skilled person that could help you (and also teach you).
There are different online way to do meta-analysis (see for example metaanalysisonline.com) but it is important to understand the different assumptions of the models that are used and the different steps.
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