I performed the Man-Whitney test to compare a metabolite between two groups. I found similar medians, but the test is significant, which seem weird to me. Also in this kind of analysis, should I report the mean or the median in my table?
Stephan provided a good response. Mann Whitney Test is a non-parametric test for comparing means and is not influenced by medians of the distribution. Therefore, it is possible to have similar medians, you should examine the means when applying any tests for comparing means.