Table 1 Baseline characteristics of the pre-match and matched samples
Variable | Before propensity score matching | After propensity score matching | ||||
|---|---|---|---|---|---|---|
SCU (n = 7,660) | ICU (n = 1,023) | Absolute standardized difference, % | SCU (n = 960) | ICU (n = 960) | Absolute standardized difference, % | |
Age (years), mean (SD) | 74.9 (12.7) | 75.3 (13.0) | 2.8 | 74.6 (13.1) | 75.3 (13.1) | 5.6 |
Male | 4,816 (58.3%) | 589 (57.6%) | 1.5 | 570 (59.4%) | 552 (57.5%) | 3.8 |
BMI (kg/m2), mean (SD) | 22.8 (4.7) | 22.5 (4.0) | 6.5 | 22.6 (3.9) | 22.5 (4.0) | 0.9 |
Ambulance use | 4,553 (59.4%) | 908 (88.6/%) | 71.0 | 859 (89.4%) | 846 (88.1%) | 4.3 |
Weekend admission | 1,965 (25.7%) | 287 (28.1%) | 5.4 | 267 (27.8%) | 267 (27.8%) | 0.0 |
History of cerebrovascular disease | 2,112 (27.6%) | 257 (25.1%) | 4.8 | 253 (26.3%) | 242 (25.2%) | 2.2 |
Total dependence in ADL at admission | 1,305 (17.0%)) | 437 (42.7%) | 58.4 | 364 (37.9%) | 384 (40.0) | 4.3 |
mRS before stroke (median) | 1 | 0 | 38.5 | 0 | 0 | 9.4 |
 mRS ≤ 1 | 2,751 (35.9%) | 783 (76.5%) | 25.1 | 752 (78.3%) | 724 (75.4%) | 6.9 |
 mRS ≤ 2 | 4,305 (56.2%) | 853 (83.4%) | 12.7 | 808 (84.1%) | 793 (82.6%) | 4.2 |
 mRS ≤ 3 | 5,394 (70.4%) | 919 (89.8%) | 4.2 | 866 (90.2%) | 856 (89.2%) | 3.4 |
On-admission treatment | ||||||
 TPA | 622 (8.1%) | 351 (34.3%) | 67.6 | 274 (28.5%) | 296 (30.8%) | 5.0 |
 PCI | 24 (0.3%) | 21 (2.1%) | 16.1 | 12 (1.3%) | 13 (1.4%) | 0.9 |
 Thromboprophylaxis | 9 (0.1%) | 7 (0.7%) | 9.0 | 6 (0.6%) | 4 (0.4%) | 2.9 |
 Thrombectomy | 363 (4.7%) | 212 (20.1%) | 49.4 | 175 (18.2%) | 179 (18.6%) | 1.1 |
| Â | 885 (10.2%) | 885 (10.2%) | Â | Â | Â | Â |
 Severe Impairment in consciousness (JCS > 19) | 458 (6.0%) | 223 (21.8%) | 47.0 | 175 (18.2%) | 191 (19.9%) | 4.2 |
 Cardioembolic infarction | 2,064 (27.0%) | 554 (54.2%) | 57.7 | 488 (50.8%) | 504 (52.5%) | 3.3 |
Comorbidity | ||||||
 Hypertension | 3,554 (46.4%) | 464 (45.3%) | 2.1 | 428 (44.6%) | 431 (44.9%) | 0.6 |
 Diabetes | 1,641 (21.4%) | 199 (19.5%) | 4.9 | 211 (22.0%) | 188 (19.6%) | 5.9 |
 Dyslipidemia | 1,948 (25.4%) | 235 (23.0%) | 5.7 | 250 (26.0%) | 228 (23.8%) | 5.3 |
 Ischemic heart disease | 354 (4.6%) | 37 (3.6%) | 5.1 | 34 (3.5%) | 36 (3.8%) | 1.1 |
 Atrial fibrillation | 1417 (18.5%) | 353 (34.5%) | 36.9 | 320 (33.3%) | 321 (33.4%) | 0.2 |
 Pneumonia | 190 (2.5%) | 44 (4.3%) | 10.1 | 30 (3.1%) | 42 (4.4%) | 6.6 |
 COPD or asthma | 94 (1.2%) | 10 (1.0%) | 2.4 | 6 (0.6%) | 10 (1.0%) | 4.6 |
 CRD | 302 (3.9%) | 23 (2.2%) | 9.8 | 25 (2.6%) | 20 (2.1%) | 3.4 |
 Anemia | 103 (1.3%) | 13 (1.3%) | 0.7 | 13 (1.4%) | 11 (1.1%) | 1.9 |
 Cancer | 399 (5.2%) | 40 (3.9%) | 6.2 | 44 (4.6%) | 39 (4.1%) | 2.6 |
Annual hospital volume, case/year | Â | Â | 21.7 | Â | Â | 5.7 |
 Quartile 1 (< 21) | 6 (0.1%) | 2 (0.2%) |  | 1 (0.1%) | 2(0.2%) |  |
 Quartile 2 (21–100) | 63 (0.8%) | 36 (3.5%) |  | 24 (2.5%) | 23 (2.4%) |  |
 Quartile 3 (101–323) | 723 (9.4%) | 65 (6.4%) |  | 47 (4.9%) | 58 (6.0%) |  |
 Quartile 4 (≥ 324) | 6,868 (89.7%) | 920 (89.9%) |  | 888 (92.5%) | 877 (91.4%) |  |