Which patients are included in the estimate of 30-day emergency re-admissions in the 2018 Clinical Outcomes Publication?

All patients aged 18 or over diagnosed between 1 April 2016 and 31 March 2017 who, according to NBOCA, underwent a major resection.
Patients with cancer of the appendix or whose readmission status could not be determined from Hospital Episode Statistics (HES) were excluded.