Table 2.

Logistic regression parameters. The outcome of logistic regression is shown for a model where intensive care unit (ICU) stay more than three days is the dependent variable (primary outcome). The covariates entered into the model were IL-18 9545 genotype, age, gender, duration of bypass, pre-operative ejection fraction and whether the patient had diabetes or renal dysfunction. Renal dysfunction was defined as baseline creatinine more than 200 μmol/L

Covariate	Relative risk of ICU stay > three days	95% confidence interval	p value
IL-18 9545 TT versus TG/GG genotype	3.01	1.28 to 7.10	0.012
Age (per year)	1.01	0.98 to 1.04	0.608
Gender (female)	0.95	0.40 to 2.27	0.905
Duration of bypass (per hour)	2.09	1.49 to 2.93	0.000
Ejection fraction (per %)	0.97	0.95 to 1.0	0.026
Diabetes	1.10	0.50 to 2.43	0.806
Renal dysfunction	1.77	0.36 to 8.63	0.482