Go to the VIT table and search for Vulnerable Items with a state = deferred. In the reports modules select the type of report you want and then build the filter on the vulnerable items table with State = Deferred. There should already be some reports that have this metric already defined.
Performance Analytics Widget: Deferred Vulnerable Items by Reason
Standard Reports: Deferred Vulnerable Items by Reason, Deferred vulnerable items reactivating this month
