Incidence of adverse events in an integrated US healthcare system: a retrospective observational study of 82,784 surgical hospitalizations

Table 2 Adverse event severity levels

Level 0	Did not reach patient
Level 1	No change in patient outcome
Level 2	Increased monitoring required; therapy changed/held/discontinued
Level 3	Additional labs or diagnostic tests were ordered; vital signs changed
Level 4	Reason for admission; prolonged length of stay
Level 5	Transfer to ICU; monitored bed required; invasive procedure required
Level 6	Patient death
Recoding	levels 0–1 = mild severity
	levels 2–3 = moderate severity
	levels 4–6 = substantial severity

ISSN: 1754-9493