As you land on the Reports screen, you see all available reports segregated into Detailed and Summary Reports sections. A detailed report displays extensive stats regarding the feature. It includes all the event features in which extensive detail is recorded from the user while setting it up.
On the other hand, only 2 reports i.e. Registration and Attendee Questions reports are categorized as summary reports. These reports only present the count of registrations and questions respectively. There is no detailed tabulation at the user-level like the Check In and Registration reports.