Comparison of the STS-score to the LES in detail and as a mosaic plot. In literature, a STS cut-off value of 10% was recommended to triage patients as “high risk”. In our population, only very few patients reach this cut off and especially the deceased patients often presented with a low STS score. In 2 high-risk patients that deceased after the operation, calculation of the STS score was impossible due to missing information. The mosaic plot is a two dimensional comparison of three variables: The size of the marked area correlates with the number of patients in the subgroup. At a glance it can be noted that only very few patients exceed an STS score of 10%, that most of these also exceed an LES of 20% and that no patient with an LES lower 20% and exceeding an STS of 10% deceased.