Risk-adjustment in hepatobiliarypancreatic surgery

Table 5 Analysis of the separate risk scoring systems by unifactorial ordered logistic regression using sampling quartiles for continuous variables.

Risk score/factor	Group	Number of patients(% of total)	Minor/intermediate complications (%)	Major complications/death (%)	Unadjusted odds ratio1	95%CI1
POSSUM	12-13	62 (35.0)	13 (21)	7 (11.3)	1
Physiological	14-15	53 (29.9)	20 (37.7)	6 (11.3)	1.8	0.24, 3.77
Score12	16-17	31 (17.5)	13 (41.9)	3 (9.7)	1.9	0.81, 4.41
	18-31	31 (17.5)	10 (32.3)	8 (25.8)	3.12	1.32, 7.38
APACHE II	0-1	30 (16.9)	9 (30)	3 (10)	1
Acute	2-3	66 (37.3)	20 (30.3)	6 (9.1)	0.97	0.41, 2.28
Physiological	4-5	49 (27.7)	14 (28.6)	7 (14.3)	1.18	0.48, 2.89
Score13	6-13	32 (18.1)	13 (40.6)	8 (25)	2.86	1.09, 7.5
ASA	1	47 (26.6)	12 (25.5)	3 (6.4)	1
	2	77 (43.5)	27 (35.1)	8 (10.4)	1.73	0.15, 3.63
	3-4	31 (17.5)	17 (33.3)	12 (23.5)	3.16	1.41, 7.07
	Missing	2 (1.1)
Child-Pugh	A	145 (81.9)	49 (33.8)	16 (11)	1
	B	32 (18.1)	7 (21.9)	8 (25)	1.34	0.64, 2.94
	C	0
INR	<0.9	45 (25.4)	13 (28.9)	4 (8.9)	1
	0.9-1.1	119 (67.2)	36 (30.3)	16 (13.5)	1.32	0.67, 2.63
	>1.1	13 (7.3)	7 (53.9)	4 (30.7)	5.5	1.78, 17.5
Blood loss	<1	90 (50.9)	24 (26.7)	9 (10)	1
	1-2	38 (21.5)	11 (29.0)	2 (5.3)	0.85	0.39, 1.85
-	>2	49 (27.7)	21 (43.0)	13 (26.0)	4.1	1.49, 11.13

¹For illustration purposes all the scores (continuous variables) were grouped into meaningful quartiles. †Odds ratios and 95% confidence intervals (CI) calculated using unifactorial ordered logistic regression analysis.

²Theoretical range of values for the physiological score of POSSUM is 12-96.

³Theoretical range of values for the acute physiological score of APACHE II is 0-44.