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Table 3 Adverse event definition

From: Design of a prospective cohort study to assess ethnic inequalities in patient safety in hospital care using mixed methods

Adverse event An unintended injurya that results in disability that results in temporary or permanent disability, death, or prolonged hospital stay and is caused by health care management rather than by the patient’s underlying disease process.
In our study, determination of the presence of an adverse event was based on 3 criteria:
1. An unintended (physical and/or mental) injury which
2. Results in temporary or permanent disability, death or prolongation of hospital stay, and is
  3. caused by health care management rather than the patient’s disease
Preventable adverse event An adverse event resulting from an error in management due to failure to follow accepted practice at an individual or system level. Accepted practice is the ‘current level of expected performance for the average practitioner or system that manages the condition in question’.
  1. a Any disadvantage for the patient that leads to prolonged or strengthened treatment, temporary or permanent (physical or mental) impairment or death.