Completeness of data
| Prognostic factor | Number (%) with data available |
|---|---|
| *Dukes’s stage “unknown” has been included as a category with survival consistently below that of stage D. Patients with known stage A to D comprise 86.7% of the sample (n=4488). †Combined model includes cases with unknown cause of death as censored on date of death. n (with all prognostic factors and a known cause of death) = 4357. | |
| Deprivation score | 5035 (97.3) |
| Age | 5173 (99.9) |
| Sex | 5176 (100) |
| Stage of disease* | 5176 (100) |
| Number of comorbidities | 5176 (100) |
| Site of cancer | 5173 (100) |
| Emergency or elective procedure | 4546 (87.8) |
| Specialist status of surgeon | 5171 (99.9) |
| Workload of surgeon | 4758 (91.9) |
| All prognostic variables | 4421 (85.4) |
| Survival time calculated | 5166 (99.8) |
| Cause of death known/alive at 5 years | 5098 (98.5) |
| All cases in combined model† | 4419 (84.2) |