Table 4 Adverse Occurrence Severity Score developed to distinguish actual effect from the magnitude of risk associated with adverse occurrences.

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.