Table 1.
Baseline characteristics of patients with STEMI.
| Characteristics | 2011–2012 (n = 1548) | 2016–2018 (n = 4748) | Statistics | P-value |
|---|---|---|---|---|
| Age | 63.8 (55.8–72.0) | 63.1 (52.8–71.0) | 2.84* | 0.004 |
| ≥75 years | 265 (17.1) | 798 (16.8) | 0.08† | 0.776 |
| Women | 437 (28.2) | 1156 (24.3) | 9.31† | 0.002 |
| Han Chinese | 1535 (99.2) | 4698 (98.9) | 0.54† | 0.464 |
| Farmer | 831 (53.7) | 3209 (67.6) | 98.16† | <0.001 |
| Secondary hospital | 723 (46.7) | 2283 (48.1) | 0.89† | 0.346 |
| Risk factors | ||||
| Hypertension | 726 (46.9) | 2091 (44.0) | – | 0.052 |
| Diabetes | 255 (16.5) | 823 (17.3) | 0.61† | 0.435 |
| Current smoker | 623 (40.2) | 1900 (40.0) | 0.03† | 0.873 |
| Medical history | ||||
| Ischemic stroke | 148 (9.6) | 582 (12.3) | 8.28† | 0.004 |
| Coronary heart disease | 124 (8.0) | 295 (6.2) | 6.07† | 0.014 |
| MI | 101 (6.5) | 246 (5.2) | 4.05† | 0.044 |
| PCI | 42 (2.7) | 152 (3.2) | 0.93† | 0.334 |
| Coronary artery bypass graft | 4 (0.3) | 6 (0.1) | 0.59† | 0.444 |
| Clinical characteristic | ||||
| Cardiogenic shock | 81 (5.2) | 278 (5.9) | 0.84† | 0.359 |
| Anterior MI | 855 (55.2) | 2673 (56.3) | 0.54† | 0.464 |
| Heart rate | ||||
| <50 beats/min | 41 (2.6) | 207 (4.4) | 9.03† | 0.003 |
| 50–109 beats/min | 1419 (91.7) | 4288 (90.3) | 2.53† | 0.112 |
| ≥110 beats/min | 88 (5.7) | 253 (5.3) | 0.29† | 0.591 |
| Systolic blood pressure | ||||
| <90 mmHg | 46 (3.0) | 205 (4.3) | 5.53† | 0.019 |
| 90–139 mmHg | 1010 (65.2) | 2842 (59.9) | 14.27† | <0.001 |
| ≥140 mmHg | 492 (31.8) | 1701 (35.8) | 8.41† | 0.004 |
| Length of stay (days) | 11.0 (8.0–15.0) | 10.8 (7.7–13.9) | 3.22* | 0.001 |
Data are presented as median (interquartile range) or n (%). *Z value. †Chi-squared value. MI: Myocardial infarction; PCI: Percutaneous coronary intervention; STEMI: ST elevation myocardial infarction; –: Not applicable.