Table 2.

Contributory factors by incident type (see supplemental Appendix 1 for a more detailed breakdown).

Incident type	Contributory factors
	Patient factors	Staff factors	Equipment/ medication	Transfer of care/handovers
Referrals and transfers of patients	2	6	1	23
Diagnostic error	8	19	0	15
Errors in assessment	1	2	0	9
Treatment errors	5	20	5	39
Medication errors	5	17	1	10
Investigation/imaging errors	1	4	0	8
Communication errors	1	1	0	3
Equipment incidents	1	1	4	1
Administration errors	0	0	0	3