Table 6. Multivariate analysis of risk factors for nosocomial infection.

Variables	Adjusted OR (95% CI)	P value
Pre-ECMO creatinine level, mg/dL	2.176 (1.065–4.447)	0.033
Duration of ECMO support, day	1.400 (1.081–1.815)	0.011

OR = odds ratio, CI = confidence interval, ECMO = extracorporeal membrane oxygenation.

^*Variables with a probability valve < 0.20 in univariate analyses were candidates for multivariate analysis. The candidate variables were gender, pre-ECMO creatinine level, transfusion history, and duration of ECMO support.