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Median cardiopulmonary bypass time for all scores of each system of the SOFA score. For each system, SOFA 0 was used as the reference group for comparison with other scores, using a Kruskal–Wallis chi-squared test. The following symbols were used in figures to indicate statistical significance: ns: non-significant; P < 0.05 (*); P < 0.01 (**); P < 0.001 (***); P < 0.0001 (****). SOFA: Sequential Organ Failure Assessment.
