Adverse event severity scale
| 0 = | minor severity (no disability, no significant resultant discomfort: no cosmetic or functional impairment: and no increased length of stay as a result of adverse event) |
| 1 = | minor temporary (minimal to moderate clinical effect requiring no or minimal clinical intervention, or no increased length of stay or re-hospitalisation for same or related problem) |
| 2 = | minor permanent (minimal to moderate clinical effect with permanent residual, and without significant functional or cosmetic impairment) |
| 3 = | major temporary (moderate to severe clinical effect with no significant functional or cosmetic residual effect). This usually results in increased length of stay or re-hospitalisation and requires moderate to major clinical intervention. |
| 4 = | major permanent (moderate to severe clinical effect with significant functional or cosmetic residual). |
| 5 = | potential major or major contributing (when doubt exists as to the outcome but the probability is that a major impairment or repeated hospitalisation will be necessary). The outcome may result in major impairment. |
| 6 = | Death |