TABLE 1.

Classification of Reported Events From Phases 1 and 2

Category	n	%
Errors of diagnosis
Error or delay in diagnosis	88	7.2
Patient misidentification	30	2.4
Use of inappropriate tests or therapy	5	0.4
Failure to use indicated tests	12	1
Failure to act on results of monitoring or testing	2	0.2
Subtotal	137	11.2
Errors of treatment
Wrong medication or wrong dose or schedule or infusion rate*	581	47.2
Error in administration or method of using a treatment	176	14.3
Patient misidentification	85	6.9
Error in the performance of an operation, procedure, or test	53	4.3
Avoidable delay in treatment or in responding to an abnormal test	39	3.2
Inappropriate (not indicated) care	15	1.2
Subtotal	949	77.2
Errors of prevention
Failure to provide prophylactic treatment	0	0
Inadequate monitoring or follow-up treatment	0	0
Patient misidentification	0	0
Subtotal	0	0
Other errors
Other system failure	84	6.8
Equipment failure	23	1.9
Patient misidentification	21	1.7
Failure of communication	16	1.3
Subtotal	144	11.7
Total	1230	100