Please update the last sentence from "These events are characterized by the need to capture cause-and-effect (although they might not be known at the time of the event), severity, and outcome." to "These events are characterized by the need to capture cause-and-effect (although they might not be known at the time of the event), seriousness, severity, and outcome." 

Adding "seriousness" which is an essential qualifier that differentiates AEs vs. SAEs.