Baseline characteristics of retrospective cohort of operated chronic subdural haematoma (n=530)
| All (n=530) | Referred (n=491) | Local (n=39) | P value | |
| Variable | Median (IQR) | |||
| Age, years | 77 (69–84) | 77 (70–84) | 74 (62–79) | 0.010* |
| Creatinine, μmol/L | 73 (61–89) | 73 (61–89) | 76 (64–100) | 0.350 |
| Time to surgery (within centre), hours | 20.1 (9.5–40.3) | 20.1 (9.8–42.7) | 19.7 (5.2–35.9) | 0.363 |
| n (%) | ||||
| Male | 376 (70.8) | 349 (70.9) | 27 (69.2) | 0.855 |
| ASA ≥3 | 271 (61.0)% | 250 (61.2) | 20 (57.1) | 0.718 |
| Cognitively impaired | 270 (54.5)% | 254 (54.9) | 16 (48.5) | 0.485 |
| Admission GCS 15 | 342 (64.4) | 317 (64.5) | 25 (64.1) | 1 |
| Admission Motor Score 6 | 490 (92.3) | 459 (93.5) | 31 (79.5) | 0.001* |
| mRS ≥2 | 105 (31.0)% | 104 (21.2) | 1 (20.0) | 1 |
| Anticoagulants/antiplatelets | 232 (43.9) | 211 (43.0) | 21 (53.8) | 0.241 |
| CVS disease | 238 (45.0) | 225 (45.8) | 13 (33.3) | 0.136 |
| Heart failure | 101 (19.0) | 90 (18.3) | 11 (28.2) | 0.139 |
| Airways disease | 75 (14.1) | 66 (13.4) | 9 (23.1) | 0.099 |
‘Referred’ indicates cases referred from a regional hospital for surgery. ‘Local’ indicates a case admitted directly to the tertiary centre. Motor Score refers to score on the motor (movement) component of the Glasgow Coma Scale.
ASA of 3 or more indicates presence of significant systemic comorbidity, Modified Rankin Scale of 2 or more indicates a level of disability that impedes normal activity. % Indicates that value is calculated only on those with recorded values. P value calculated for Mann-Whitney U (continuous data) or Fisher’s exact test (categorical).
*Indicates significant at 5% level.
ASA, American Society of Anesthesiologists Score; CVS, cardiovascular; GCS, Glasgow Coma Scale; mRS, Modified Rankin Score.