Table 2

Outcome variables

VariableSampling timeData source
30-day mortality*All cause, within 30 days from surgeryElectronic patient record
90-day mortalityAll cause, within 90 days from surgeryElectronic patient record
Postoperative complications†Events occurring until hospital dischargeElectronic patient record
Total length of stayIn daysElectronic patient record
ReadmissionsNumber including reasonsElectronic patient record

  • *Primary outcome variable.

  • †Postoperative complications will be ranked according to Clavien-Dindo classification.