Table 1.
Baseline Characteristics of the Study Population
| Variable | Unmatched | Propensity Score Matched | ||||
|---|---|---|---|---|---|---|
| Before Accreditation | After Accreditation | P Value | Before Accreditation | After Accreditation | P Value | |
| n | 7544 | 7800 | 6700 | 6700 | ||
| Age, y | 62.48 (12.61) | 62.52 (12.52) | 0.838 | 62.36 (12.62) | 62.42 (12.67) | 0.782 |
| Female sex | 1796 (23.8) | 1808 (23.2) | 0.369 | 1564 (23.3) | 1566 (23.4) | 0.984 |
| Hospital location: provincial capital | 4554 (60.4) | 5122 (65.7) | <0.001 | 4240 (63.3) | 4301 (64.2) | 0.281 |
| First medical facility: hospital | 3712 (49.2) | 4124 (52.9) | <0.001 | 3367 (50.3) | 3366 (50.2) | 1.000 |
| Department: Emergency/catheter lab | 5278 (70.0) | 6046 (77.5) | <0.001 | 5025 (75.0) | 4995 (74.6) | 0.564 |
| Type of MI | ||||||
| STEMI | 5296 (70.2) | 5659 (72.6) | 0.001 | 4824 (72.0) | 4831 (72.1) | 0.908 |
| Killip class | ||||||
| I | 5298 (70.2) | 5797 (74.3) | <0.001 | 4835 (72.2) | 4879 (72.8) | 0.651 |
| II to III | 1966 (26.1) | 1735 (22.2) | 1624 (24.2) | 1593 (23.8) | ||
| IV | 280 (3.7) | 268 (3.4) | 241 (3.6) | 228 (3.4) | ||
| Comorbidity | ||||||
| Current smoking | 3577 (47.4) | 3760 (48.2) | 0.335 | 3213 (48.0) | 3198 (47.7) | 0.809 |
| Hypertension | 4052 (53.7) | 3992 (51.2) | 0.002 | 3534 (52.7) | 3389 (50.6) | 0.013 |
| Dyslipidemia | 543 (7.2) | 358 (4.6) | <0.001 | 344 (5.1) | 352 (5.3) | 0.785 |
| Diabetes mellitus | 1694 (22.5) | 1733 (22.2) | 0.739 | 1477 (22.0) | 1500 (22.4) | 0.648 |
| Heart failure history | 120 (1.6) | 71 (0.9) | <0.001 | 65 (1.0) | 69 (1.0) | 0.795 |
| Renal failure history | 84 (1.1) | 85 (1.1) | 0.949 | 74 (1.1) | 70 (1.0) | 0.802 |
| Previous MI | 575 (7.6) | 453 (5.8) | <0.001 | 395 (5.9) | 412 (6.1) | 0.561 |
| Previous PCI or CABG | 446 (5.9) | 519 (6.7) | 0.063 | 391 (5.8) | 412 (6.1) | 0.467 |
| Preadmission medication | ||||||
| Aspirin | 1288 (17.1) | 1259 (16.1) | 0.126 | 1081 (16.1) | 1104 (16.5) | 0.607 |
| P2Y12 receptor inhibitors | 935 (12.4) | 929 (11.9) | 0.372 | 794 (11.9) | 820 (12.2) | 0.507 |
| Statins | 908 (12.0) | 815 (10.4) | 0.002 | 714 (10.7) | 738 (11.0) | 0.523 |
Data are expressed as mean±SD or n (%). CABG indicates coronary artery bypass grafting; MI, myocardial infarction; PCI, percutaneous coronary intervention; STEMI, ST‐segment–elevation myocardial infarction.