I am doing a meta-analysis, one of the outcomes is about blood antioxidant capacity, but one study has presented its outcome as biological antioxidant potential (BAP), while the others as Total Antioxidant capacity (TAC), my question is if I can pool all the results into one using standarized mean difference instead of mean difference to account for the different measurements.
Methods for measuring the antioxidant capacity of a given extract are quite diverse and should not be pooled to get an "average" value, since they do not necessarily evaluate the same metabolic pathways that are supposed to be involved in the reaction assayed. You could try to perform a multivariate test to see eventually which one/s may better explain the hypothesis you intend to test in your particular experimental system.
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