Table 5.

Potential preventability criteria

Rating	Category
1	Virtually no evidence of preventability
2	Slight-to-modest evidence of preventability
3	Preventability not quite likely (less than 50/50, but “close call”)
4	Preventability more than likely (more than 50/50, but “close call”)
5	Strong evidence of preventability
6	Virtually certain evidence of preventability

Criteria used to determine potential preventability in EPOCH. These criteria were used in the Canadian Adverse Events Study. A rating of 4 or more will be regarded as a high degree of preventability. Potentially preventable cardiac arrests will be presented as rate per thousand patient-days.