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 |
| 885 (10.2%) | 885 (10.2%) | |||||
| 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 | 21.7 | 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%) | ||
Data are shown as numbers (%) unless otherwise stated
BMI Body mass index, COPD Chronic obstructive pulmonary disease, CRD Chronic renal disease, DCM Dilated cardiomyopathy, GW General ward, HF Heart failure, ICU Intensive care unit, IHD Ischemic heart disease, NYHA New York Heart Association, PH Pulmonary hypertension, pre-ADL Activity of daily living at admission, PVD Peripheral vascular disease, SD Standard deviation, VHD Valvular heart disease