Multivariable Cox regression model for postoperative time to discharge in a cohort of patients undergoing surgery for chronic subdural haematoma (n=531), pooled across m=40 imputed data sets
| HR | 95% CI | P value | |
| Age (per year increase) | 0.99 | 0.99 to 1.00 | 0.114 |
| Sex (male vs female) | 1.09 | 0.90 to 1.33 | 0.351 |
| GCS 15 (vs any-other value) | 1.03 | 0.97 to 1.08 | 0.377 |
| Referred patient | 1.46 | 0.98 to 2.17 | 0.063 |
| ASA (per 1 level increase) | 0.90 | 0.77 to 1.06 | 0.217 |
| Admission complications | 1.06 | 0.99 to 1.12 | 0.093 |
| Airways disease (yes/no) | 1.03 | 0.79 to 1.34 | 0.819 |
| CVS disease (yes/no) | 0.96 | 0.77 to 1.18 | 0.676 |
| Anticoagulated on admission (yes/no) | 0.45 | 0.37 to 0.54 | <0.001* |
| Heart failure (yes/no) | 1.02 | 0.77 to 1.33 | 0.908 |
| mRS (per 1 level increase) | 0.99 | 0.91 to 1.09 | 0.885 |
| Baseline creatinine (per 20 µmol/L increase) | 0.98 | 0.94 to 1.01 | 0.242 |
| Cognitive concern (yes/no) | 0.71 | 0.58 to 0.87 | <0.001* |
| Operative time (per 10 min increase) | 0.99 | 0.91 to 1.01 | 0.357 |
| Postoperative complications (per 1 domain increase in ePOMS) | 0.61 | 0.55 to 0.68 | <0.001* |
HRs >1 indicate association with a more rapid time to discharge.
*Indicate statistical significance at the 5% level. Postoperative complications included as a time-dependent covariate (by day).
ASA, American Society of Anesthesiologists score; CVS, cardiovascular; ePOMS, Electronic Postoperative Morbidity Score; GCS, Glasgow Coma Scale; mRS, Modified Rankin Scale.