This drill down is useful when the AE Distribution report dialog option to Count multiple occurrences of an event per subject is checked.For example: When the Count multiple occurrences of an event per subject dialog check box is UNCHECKED, the software automatically picks representative subject event records based on the most SERIOUS (AESER = Y), SEVER (AESEV), and then first occurring. This way, the descriptive quality of the AE occurrence selected to be representative of each subject is likely the most notable.