I have tried your solution and got following error:

??? Attempted to access CONN_h.menus.m_results.roiresults.idx(85); index out of bounds because
numel(CONN_h.menus.m_results.roiresults.idx)=84.

Error in ==> conn_exporttable at 37
            n2=CONN_h.menus.m_results.roiresults.idx(n1);
 
??? Error while evaluating uimenu Callback

When I tried to export stats as a mat-file I thought it had worked in the first place. But then I realized that not the altered values (due to selection of ROIs) but only the original values with the exception of the value of the unselected ROIs had been saved into the mat-file. Any ideas on that?

Thanks again.