Fig. 3: Findings during problem-based learning exploration.

a–d, Kaplan–Meier curves for 1-year postoperative mortality for patients undergoing elective curative intended surgery, stratified by whether patients developed a postoperative complication graded as CD 2 or higher during the first 30 days following surgery different factors: age group (a), CC-index (b), WHO PS (c) and UICC stage (d). e, Correlation matrix between each factor and the development of postoperative complications graded CD 2 or higher and Spearman’s rho between each factor.