Estimates of relative rates2-150associated with enrolment period before (Model I) and after (Model II and III) adjustment for the occurrence of scheduling delays
| Covariate | Model I | Model II | Model III |
| Period 1 | 1.0 | 1.0 | 1.0 |
| after delay | — | — | 0.6 (0.4, 0.8) |
| Period 2 | 0.8 (0.7, 0.9) | 0.9 (0.8, 1.0) | 0.9 (0.8, 1.1) |
| after delay | — | — | 0.4 (0.3, 0.5) |
| Delay | — | 0.5 (0.4, 0.6) | — |
↵2-150 Adjusted for gender, age, urgency, and type of surgery.