Table 2.

Frequency of major and minor flow disruptions by their type, location, number and role of staff involved

	Major disruptions (out of 100%)					Minor disruptions (out of 100%)
	Layout	Environmental hazard	Interruptions	Usability/ equipment failure	Total	Layout	Environmental hazard	Interruptions	Usability/ equipment failure	Total
	56	10	30	4	100	69	29	1	1	100
Flow disruption location
Anaesthesia workstation zone	21	3	7	1	32.1	23.6	12.2	1	0	36.8
Transitional zone 1 zone	4	1.1	2.2	0	7.4	4.4	2	0.1	1	7.6
Transitional zone 2 zone	6	0.2	4.5	0.2	10.8	10.2	1.6	0.1	0	11.8
Transitional zone 3 zone	7	1.3	0.8	0.5	9.6	10.9	3.7	0.1	0.1	14.7
Surgical table 1 zone	7	1.4	4.8	1	14.2	4.2	4	0.3	0.1	8.6
Surgical table 2 zone	7.2	2	3.7	1.8	14.6	2.5	1.9	0	0.1	4.6
Support zones	2.4	0	2.4	0.5	5.3	4.3	1.1	1	0	6.4
Supply zones	2	0.3	1	0	3.3	5.8	1.2	1	0	8
Other	0.5	0	1.3	1	2.8	0.8	0.3	0.4	0	1.6
Number of staff involved in flow disruption
1	48	8.7	22	3.2	81.9	49.6	27.7	0.3	0.5	78.1
>1	7.9	0.9	7	2.3	18.1	19.4	1	1.4	0.1	21.9
Role of staff involved in flow disruption
Anaesthesiologist/student/resident	22.7	3	7.6	1.6	34.9	32	12.2	0.3	0.2	44.8
RN, circulating	12.1	2.8	11.2	1.8	27.9	14.9	4.4	0.8	0.1	20.3
MD, surgeon/student/resident	7.7	1.7	1.7	0.9	12	10.2	2.8	0.5	0.1	13.6
RN, scrub/surgical tech/student	5.7	0.6	3.8	1.1	11.2	6.4	3.8	0.3	0	10.5
Other	4.5	1.5	7	1.1	14	7.7	2.6	0.5	0.1	10.9

MD, medical doctor; RN, registered nurse.