Covariate Hazard ratio Standard error 95% confidence interval P value
Porcine root 0.29 0.29 0.044 – 1.97 0.208
Mechanical valve 0.52 0.46 0.092 – 2.96 0.462
Age 1.02 0.022 0.98 – 1.07 0.214
Euroscore 1.03 0.023 1.01 – 1.07 0.046
NYHA score 1.03 0.20 0.70 – 1.50 0.894
Haemodynamic instability 3.74 2.19 1.19 – 11.80 0.024
COPD 2.12 1.13 0.74 – 6.03 0.159