Table 3.

Logistic regression parameters. The outcome of logistic regression is shown for a model where low post-cardiopulmonary bypass (CPB) Systemic Vascular Resistance Index (SVRI) is the dependent variable (secondary outcome). The covariates entered into the model were IL-18 9545 genotype, age, gender and duration of bypass.

Covariate	Relative risk of low post-CPB SVRI	95% confidence interval	p value
IL-18 9545 (TT versus TG/GG genotype)	1.57	1.01 to 2.44	0.045
Age (per year)	1.01	0.98 to 1.03	0.480
Gender (female)	0.70	0.39 to 1.27	0.703
Duration of bypass (per hour)	1.03	0.66 to 1.62	0.889