Multivariate analysis of the risk for pulmonary complication after gastrointestinal surgery

Table 2 Variables associated with PPC by multivariate logistic regression.

Variable	Parameter estimate	SE	OR	95%CI	P
Age (yr)	0.039	0.007	1.040	1.027-1.054	0
History of respiratory diseases	1.090	0.278	2.976	1.724-5.135	0
Volume of preoperative erythrocyte transfusion	0.001	0.000	1.002	1.001-1.003	0.011
Serum albumin	-0.047	0.018	0.954	0.921-0.988	0.009
Length of intraoperative intratracheal intubation	0.002	0.001	1.002	1.001-1.004	0
Length of nasogastric intubation	0.049	0.022	1.050	1.007-1.096	0.023
Length of postoperative mechanical ventilation	0.630	0.232	1.878	1.193-2.957	0.007
Length of preoperative antibiotics therapy	0.070	0.033	1.072	1.005-1.145	0.037
Chemotherapy 2 wk before operation	1.168	0.445	3.214	1.345-7.684	0.009