Table 3.

Categorization of adverse events

Category	Patients (n)	Triggers (n)	Patients related to potential for harm (AE 1) (n (% (95% CI))	Patients related to harm identified (AE 2) (n (% (95% CI))
Category 1: The AE was the result of action(s) by the patient.	68	102	3 (4.4 (1.1–13.2))	0 (0 (0–0))
Category 2: The AE was the result of action(s) or inaction(s) by the crew.	622	898	36 (5.8 (4.1–8.0))	2 (0.3 (0.1–1.3))
Category 3: Failure of the equipment, failure to troubleshoot and correct common problems with the equipment	5	5	2 (40.0 (7.3–83.0))	0 (0 (0–0))
Category 4: Factors that may result from weather conditions or factors on the ground/at the scene	0	0	0 (0 (0–0))	0 (0 (0–0))
Category 5: The cause of the AE cannot be determined by the information available in the chart.	40	64	2 (5.0 (0.9–18.2))	1 (2.5 (0.1–14.7))

AE adverse event

CI confidence interval