The drivinghealth.com web site has information that will help you understand the results from DrivingHealth Inventory. Click to access general screening information on drivinghealth.com. The link on that page contains useful reference material.
If that doesn't answer your question, please review the User's Manual; the appendix has a data definition table including measure cutpoints.
If neither of these resources helps you answer your question(s), please post a new topic in this forum.