. 2019 May 27;11(5):261–270. doi: 10.4240/wjgs.v11.i5.261

Table 3.

Risk factors affecting the post-operative length of stay at hospital in multivariate analyses

Variable	Units	Estimates	95%CI	P value
Indication	CC vs CD	0.87	0.79; 0.95	< 0.01^a
Gender	male vs female	1.06	1.01; 1.10	0.01^a
Age		1.01	1.00; 1.01	< 0.01^a
BMI	≤18.5 vs 18.6-25	1.23	1.10; 1.38	< 0.01^a
	25.1-30 vs 18.6-25 >30 vs 18.6-25	0.98 1.04	0.92; 1.04 0.96; 1.12	0.54 0.35
ASA grade	IV-V vs I-III	1.04	0.94; 1.16	0.45
IHD	IHD vs no IHD	1.07	1.01; 1.13	0.01^a
Diabetes	History of diabetes vs no history of diabetes	1.02	0.96; 1.08	0.50
Smoking	Ex-smoker vs never smoker	0.98	0.92; 1.04	0.43
	Current smoker vs never smoker	1.05	0.98; 1.11	0.15
Haemoglobin		0.99	0.98; 1.00	0.06
Operating surgeon	General surgeon vs colorectal surgeon	1.10	1.05; 1.15	< 0.01^a
Urgency	Emergency vs elective/expedited	1.06	0.99; 1.14	0.08
De-functioning/primary stoma	De-functioning stoma vs no de-functioning stoma	1.46	1.21; 1.77	< 0.01^a
Duration of operation	≥ 120 vs < 120	1.08	1.04; 1.13	< 0.01^a
Operative approach	Converted vs laparoscopy	1.10	1.02; 1.18	0.01^a
	Open vs laparoscopy	1.35	1.29; 1.42	< 0.01^a
Unplanned intraoperative adverse events	Any UIAES vs no UIAEs	1.08	1.02; 1.15	0.01^a
CRP		1.00	1.00; 1.00	< 0.01^a
Previous surgery	Any previous surgery vs no previous surgery	1.03	0.98; 1.08	0.23
Resection type	Right hemicolectomy vs ileocecal resection	1.03	0.96; 1.11	0.42
Skin closure	Stapled vs suture	1.06	1.01; 1.11	0.02^a

Linear regression: The outcome is log-transformed. The model is adjusted for: Gender, age, BMI, ASA grade, ischemic heart disease, diabetes, smoking, haemoglobin, operating surgeon, urgency, defunctioning/primary stoma, duration of operation, operative approach, anastomosis type, unplanned intraoperative adverse events, CRP, previous surgery, resection type and skin closure.

Significant outcomes. IHD: Ischemic heart diseases; CRP: C-reactive protein; BMI: Body mass index; CD: Crohn’s disease; CC: Colon cancer; UIAEs: Unplanned intraoperative adverse events; ASA: American Society of Anesthesiology score.