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

From: Towards standardized measurement of adverse events in spine surgery: conceptual model and pilot evaluation

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.