Table 3

Severity of risk factors in relation to surgical complications based on Clavien-Dindo classification in a tertiary referral centre during years 2016–2018

	No complications (0)		Minor complication (1–3)		Major complication (4–7)		Other (8–9)		P value
	n	%	n	%	n	%	n	%	P value
ASA, n=4490
0	422	89	40	8	12	2.5	0	0	<0.001
1	1605	86	209	11	59	3	0	0
2	1563	80	277	14	104	5	0	0
3	128	70	33	18	21	11.5	0	0
4	3	30	0	0	7	70	0	0
MET, n=3765
1	64	82	9	11.5	5	6	0	0	0.033
2	146	80	23	13	14	8	0	0
3	214	79	44	16	10	4	2	0.7
4	1847	83	287	13	100	4.5	3	0.1
5	856	87	87	9	38	4	1	0.1
Charlson Index score, n=3367 mean	1.37		1.71		1.97		2.17		<0.001
0	1083	88	112	9	39	3	1	0.1
1–3	1503	82	240	13	81	4	4	0.2
>4	236	78	42	14	25	8	1	0.3
NRS 2002, n=3337									0.041
0	1963	86	246	11	76	3	3	0.1
1	749	83	110	12	45	5	2	0.2
2	101	81	17	14	7	6	0	0
3	14	78	4	22	0	0	0	0
Sex, n=4529									0.916
Male	1848	82.5	283	13	106	5	3	0,1
Female	1902	83	282	12	101	4	4	0.2
Type of surgery, n=4529									<0.001
Emergency	673	72	136	15	1119	13	1	0.1
Elective	3077	86	429	12	88	2	6	0.2
Alcohol intake, n=3864									0.004
0	975	83.5	155	13	38	3	0	0
1	1195	82	187	13	67	5	3	0.2
2	822	84	105	11	50	5	3	0.3
3	174	84	17	8	16	8	0	0
4	53	93	4	7	0	0	0	0
Smoking, n=3670									0.001
0	2442	83	374	13	113	4	5	0.2
1	231	84	37	13	8	3	0	0
2	297	80.5	38	10	34	9	0	0
BMI, n=5256 mean	28.4		27.9		30.0		24.1		0.63
<18.49	208	83	29	12	12	5	1	0.4
18.5–31.99	3234	83	496	13	175	4.5	5	0.1
>32	928	85	127	12	40	4	1	0.1
Age, n=4527 mean	64.7		67.6		65.5		65.1		0.001

ASA, American Society of Anesthesiologists Physical Status Classification System; BMI, body mass index; MET, metabolic equivalent of task; NRS, Nutritional Risk Screening.