Table 4. The relationships between POSSUM physiology score and clinico-pathological characteristics in patients undergoing potentially curative resection for colorectal cancer.

	Group 1	Group 2	Group 3	Group 4
	11–14	15–20	21–30	>30
Variable	(n=109)	(n=134)	(n=69)	(n=8)	P-value
POSSUM variables
Cardiac (1/2/4/8)	82/27/0/0	66/60/8/0	6/40/20/3	0/1/5/2	<0.001
Resp. (1/2/4/8)	86/23/0/0	80/39/13/2	32/15/19/3	2/2/3/1	<0.001
ECG (1/4/8)	109/0/0	125/3/6	26/12/31	2/1/5	<0.001
SBP (1/2/4/8)	59/50/0/0	43/75/15/1	26/35/7/1	0/4/4/0	<0.001
Pulse (1/2/4/8)	83/26/0/0	80/46/8/0	37/27/5/0	4/3/1/0	0.01
Hb (1/2/4/8)	71/37/1/0	33/36/43/22	14/14/13/28	0/3/2/3	<0.001
WCC (1/2/4)	104/4/1	103/28/3	49/19/1	1/6/1	<0.001
Sodium (1/2/4/8)	107/2/0/0	121/10/3/0	62/5/2/0	5/2/1/0	0.008
Potassium (1/2/4/8)	106/3/0/0	123/7/4/0	64/4/1/0	6/1/1/0	0.11
Urea (1/2/4/8)	107/2/0/0	114/16/4/0	62/6/1/0	2/1/4/1	<0.001
GCS (1/2/4/8)	109/0/0/0	134/0/0/0	69/0/0/0	8/0/0/0	N/A
Age
⩽64/65–74/⩾75	57/31/21	41/41/52	13/27/29	0/3/5	<0.001
Sex
Male/female	64/45	64/70	38/31	4/4	0.38
Smoking
Never/current or ex	54/55	55/79	25/44	1/7	0.09
Presentation
Elective/emergency	107/2	127/7	66/3	7/1	0.34
Tumour site
Colon/rectum	51/58	85/49	54/15	7/1	<0.001
Deprivation
1–2/3–5/6–7	5/42/62	5/39/93	2/19/48	0/2/6	0.47
Differentiation
Well or mod/poor	101/8	122/12	57/12	6/2	0.08
Dukes stage
A/B/C	22/46/41	13/67/54	3/37/29	0/3/5	0.03
Glasgow Prognostic Score
mGPS 0/1/2	80/22/7	77/44/13	34/21/14	3/3/2	0.006

Abbreviations: mGPS=modified Glasgow Prognostic Score; POSSUM=physiological and operative severity score for the enumeration of mortality and morbidity.