Statistical analysis: which directory to choose

Hello, I would like to do statistical analysis (two groups), but I am unsure which directory to select. If I select any of the "Results" directories (for example, Functional Connectivity), it chooses *all* images in the directory. However, there are (I think) 3 images per subject. How can I choose only the relevant ones?

You have to organize the results files first.

For example, put all the zFC maps of patients into one directory, and zFC maps of normal controls into another directory. Then perform two-sample t-test.