"Serious adverse events are defined as: • Death; • A life-threatening adverse event; • Inpatient hospitalization or prolongation of existing hospitalization; • A persistent or significant incapacity or substantial disruption of the ability to conduct normal life functions; • A congenital anomaly/birth defect; • An important medical event that based on appropriate medical judgement may jeopardize the individual and may require medical or surgical intervention to prevent one of the outcomes listed above."
So 4 out of the 6 criteria are, in fact, life-threatening, one is "your life is permanently altered, sorry", and the final one is irrelevant.
(and no, despite your link to the other thread, "persistent or significant incapacity" does not include "a sick day")
> And there was no pattern either.
They didn't release the raw data, so there's no way for you to know that.