[Koha] Collection usage report: issues field in items table

I'm trying to assess the usage of a particular collection and am wondering if the 'issues' field in the items table represents all issues: Ie., both from the old_issues and issues tables. If the total number of issues is represented in this field, the report would not need to join these tables ...which is what I'm hoping. Thanks! -- Chad Roseburg Automation Dept. North Central Regional Library