Table 4.

Adverse Occurrence Severity Score developed to distinguish actual effect from the magnitude of risk associated with adverse occurrences.

Score	Summary	Description
0	No effect, no risk	Adverse occurrence required no intervention, resulted in no adverse consequences, and had no risk of adverse consequences.
1	No effect, minor risk	Adverse occurrence required no intervention, resulted in no adverse consequences, but had the potential to result in minor consequences.
2	No effect, major risk	Adverse occurrence required no intervention, resulted in no adverse consequences, but had the potential to result in major but not life threatening adverse consequences.
3	No effect, risk of death	Adverse occurrence required no intervention, but had the potential to result in a life-threatening situation or death.
4	Minor effect, minor risk	Adverse occurrence required a minor intervention or resulted in minor loss of function, and had the potential to result in only minor adverse consequences.
5	Minor effect, major risk	Adverse occurrence required a minor intervention or resulted in minor loss of function, but had the potential to result in major loss of function, though not life-threatening.
6	Minor effect, risk of death	Adverse occurrence required a minor intervention or resulted in minor loss of function, but had the potential to result in a life-threatening situation or death.
7	Major effect, major risk	Adverse occurrence required extensive intervention such as unexpected re-operation or re-admission, or resulted in major loss of function, but was not life-threatening.
8	Major effect, risk of death	Adverse occurrence required extensive intervention such as unexpected re-operation or re-admission, or resulted in major loss of function, and had the potential to result in a life-threatening situation or death.
9	Life-threatening effect	Adverse occurrence resulted in a life-threatening situation.
10	Death	Adverse occurrence resulted in death.