Combined and intraoperative risk modelling for oesophagectomy: A systematic review

Figure 1 The preferred reporting items for systematic reviews and meta-analyses flow diagram of study selection.

Figure 2 External validation status of combined and intraoperative models. POSSUM: Physiological and operative severity score for the enumeration of mortality and morbidity; P-POSSUM: Portsmouth physiological and operative severity score for the enumeration of mortality and morbidity; O-POSSUM: Oesophagogastric physiological and operative severity score for the enumeration of mortality and morbidity; E-PASS: Estimation of physiologic ability and surgical stress; SAS: Surgical Apgar score; eSAS: Esophagectomy surgical Apgar score; IPF: Intraoperative factors.

Figure 3 Weighted mean of c-statistics for each major outcome. ROC: Receiver operating characteristics; POSSUM: Physiological and operative severity score for the enumeration of mortality and morbidity; P-POSSUM: Portsmouth physiological and operative severity score for the enumeration of mortality and morbidity; O-POSSUM: Oesophagogastric physiological and operative severity score for the enumeration of mortality and morbidity; E-PASS: Estimation of physiologic ability and surgical stress; SAS: Surgical Apgar score; eSAS: Esophagectomy surgical Apgar score; IPF: Intraoperative factors.