Figure 2From: The incidence, root-causes, and outcomes of adverse events in surgical units: implication for potential prevention strategiesMain categories of causes of surgical AEs compared with other AEs. H indicates human; O, organization; T, technical; PR, patient related; and Oth, other.a Corrected for the over-representation of deceased patients and hospital type* Significant difference between surgical AEs and other AEs (P < 0.05)Back to article page