Hello,
I have two geometric means (both of which are average antibody concentrations for a group of subjects calculated by multiplying all values and taking the nth root of this number, where n is the number of subjects with available data).
Group 1: Mean = 8985, confidence intervals = 5705–14150
67 people
Group 2: Mean = 7622, confidence intervals = 5486–10591
132 people
Overall mean: 8056.
Please could someone advise how I calculate the overall 95% confidence intervals?
Many thanks
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