Table 2

Revised probability categories

ScoreDescription in original Health Care Failure Modes and Effects AnalysisRevised description
6NAGreater than once a week
5NAGreater than once a month but less than once a week
4Frequent: likely to occur immediately or within a short period (may happen several times in 1 year)Greater than once a year but less than once a month
3Occasional: probably will occur (may happen several times in 1–2 years)Less than twice a year
2Uncommon: possible to occur (may happen sometime in 2–5 years)Once every 2–5 years
1Remote: unlikely to occur (may happen sometime in more than 5–30 years)Once every greater than 5–30 years