TableĀ 2

Secondary outcome measures

Outcome measureDefinition
Length of stayDay of admission counts as day 1, and the day of discharge as a whole day
Anastomotic leakAnastomotic leak detected clinically/symptomatically, radiologically and/or intraoperatively
Intra-abdominal/intrapelvic collectionAbscess/collection leak detected clinically/symptomatically, radiologically and/or intraoperatively
Wound infectionBased 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 eventIncludes 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