Table 2.

Secondary outcome measures

Outcome measure	Definition
Length of stay	Day of admission counts as day 1, and the day of discharge as a whole day
Anastomotic leak	Anastomotic leak detected clinically/symptomatically, radiologically and/or intraoperatively
Intra-abdominal/intrapelvic collection	Abscess/collection leak detected clinically/symptomatically, radiologically and/or intraoperatively
Wound infection	Based on the Centre for Disease Control's definition of surgical site infection,11 which is any one of: (1) Purulent drainage from the incision (2) At least two of: pain or tenderness; localised swelling; redness; heat; fever; AND the incision is opened deliberately to manage infection or the clinician diagnoses a surgical site infection (3) Wound organisms AND pus cells from the aspirate/swab
Cardiac event	Includes myocardial infarction, unstable angina, sudden death from cardiac causes, ischaemic and haemorrhagic stroke, transient ischaemic attack, peripheral arterial thrombosis, peripheral venous thrombosis and pulmonary embolus