Fig. 2

Primary outcome: root causes of unplanned events. DRF= disease related factor. PRF= patient related factor. H-ex= human external. HKK= human knowledge-based behavior. HRI= human related intervention. HSS= human skills-based. T-ex= technical external. TM= technical materials. X-nrc= unclassifiable, unrelated complication. X-FIP= unclassifiable, family involvement program