Which patients are included in the estimate of 90-day mortality for 2017 Clinical Outcomes Publication?

All patients diagnosed with bowel cancer between 1 April 2011 and 31 March 2016 who, according to NBOCA, underwent an elective or scheduled major resection regardless of curative intent. Patients under 18, those with cancer of the appendix, and those with missing date of surgery or date of surgery after date of death were excluded.