Table 1.
Baseline Characteristics for the Full Cohort and for Patients Within the Full Cohort with at Least One Head Trauma
| Characteristics | Full Cohort N (%) | Patients with Head Trauma N (%) |
|---|---|---|
| Total | 2391853 | 427,612 |
| SDH evacuations | 4086 (0.17) | 812 (0.18) |
| Age at start of study (years) | ||
| 50–65 | 1,618,025 (67.6%) | 235,076 (55.0%) |
| 65–74 | 414,916 (17.3%) | 86,893 (20.3%) |
| 74–84 | 258,666 (10.8%) | 74,633 (17.5%) |
| 85+ | 100,246 (4.2%) | 31,010 (7.3%) |
| Sex | ||
| Female | 1252264 (52.4%) | 243,613 (57.0%) |
| Male | 1139589 (47.6%) | 183,999 (43.0%) |
| Comorbidities and co-medications | ||
| Alcohol addiction | 113110 (4.7%) | 38,311 (9.0%) |
| Chronic hepatic disease | 45526 (1.9%) | 12,862 (3.0%) |
| Renal insufficiency | 92521 (3.9%) | 23,116 (5.4%) |
| Anticoagulant treatment | 845407 (35.3%) | 197,122 (46.1%) |
| Diabetes mellitus | 279584 (11.7%) | 56,120 (13.1%) |
| Previous cerebral infarction | 104973 (4.4%) | 27,836 (6.5%) |
| Antihypertensive treatment | 1463967 (61.2%) | 303,087 (70.9%) |
| Conditions predisposing for head trauma | 11170 (0.5%) | 6539 (1.5%) |
| Disposing neurological disorders | 192231 (8.0%) | 65,553 (15.3%) |
| Statins | 452734 (18.9%) | 110,141 (25.8%) |
| Autoimmune disorders | 879263 (36.8%) | 177,485 (41.5%) |
| Glucocorticoids | 7507 (0.3%) | 1490 (0.3%) |
| NSAIDs* | 256,309 (10.7%) | 53,921 (12.6%) |
Abbreviations: CSDH, Chronic subdural haematoma; * NSAIDs, Non-steroid anti-inflammatory drugs.