Supplementary Table 2. POSSUM Operative Severity Score.

	Score
	1	2	4	8
Operative severity	Minor	Moderate	Major	Major+
Multiple procedures	1		2	>2
Total blood loss, mL	≤100	101-500	501-999	≥1000
Peritoneal soiling	None	Minor, serous fluid	Local pus	Free bowel content, pus or blood
Presence of malignancy	None	Primary only	Nodal metastasis	Distant metastasis
Mode of surgery	Elective		Emergency resuscitation of >2 hrs possible	Emergency
			Operation <24 hrs after admission	Immediate surgery <2 hrs needed

POSSUM, Physiological and Operative Severity Score for enUmeration of Mortality and morbidity.