Appendix 1.

Categorization of reason for cancellations of surgery into: patient-, process-, and structure-related reasons. The frequency of cancellation by reason over the 5 year study period has been included.

Group 1: Patient	Frequency	Group 2: Process	Frequency	Group 3: Structural	Frequency
Case Aborted Post Anesthesia	1	Administration Reconciliation	1	Crisis Cancellation	27
Done previously as an Emergency	6	Anaesthesiologist Late	3	Emergency A Case	33
Medical reasons	4	Cancelled by Institution	3	Emergency Case inserted Other Service	14
Patient did not show	16	Delayed Start Time	2	Emergency Case inserted Same Service	153
Patient Expired	2	Incorrectly booked Surgeon Office	19	Equipment Broken	7
Patient not available	27	Insufficient Work Up	8	No Bed	49
Patient Refused Procedure	48	Moved to another date surgeon office	16	No Step down Bed	54
Patient too ill/ not fit for surgery	175	No Anesthesia Available	24	No ICU bed	8
Surgery no longer needed/inoperable	23	Office cancelled	9	Room unavailable	5
		Operating Room/PACU Staff Problems	15	Weather	2
		Patient not NPO	21
		Room on hold/other room running late	10
		Room running late	71
		Scheduling error OR office	3
		Standby patient cancelled	266
		Surgeon ill or not able to operate	2
		Surgeon overbooked	11
		Surgery running late	406
Total	302	Total	890	Total	352