Elderly patients had more severe postoperative complications after pancreatic resection: A retrospective analysis of 727 patients

Table 4 Univariate and multivariate Cox proportional hazards models for severe postoperative complications (grades IIIb-V)

Variable	Subgroup	Univariate	Multivariate
		P value	P value	HR (95%CI)
Medical risk factors
Age in yr	< 65 vs ≥ 65	0.002	0.010	1.63 (1.18-6.30)
BMI	< 24 kg/m2vs ≥ 24 kg/m2	0.012	0.041	1.20 (1.07-5.89)
ASA classification	I/II vs III/IV	0.038	0.271	-
Surgical risk factors
Pancreaticoduodenectomy	Yes vs No	< 0.001	0.017	4.86 (1.20-8.31)
Length of operation	< 241 min vs ≥ 241 min (median)	0.004	0.012	2.97 (1.04-6.14)

ASA: American Society of Anesthesiologists; BMI: Body mass index; CI: Confidence interval; HR: Hazard ratio.