Table 1 Baseline demographics and clinical characteristics of patients in the training set and validation set
Variables | Training set (N = 1324) | Validation set (N = 662) | P value |
|---|---|---|---|
Discrete variables | Â | Â | Â |
Sex | Â | Â | 0.012 |
 Men (%) | 1076 (81.3) | 506 (76.4) |  |
 Women (%) | 248 (18.7) | 156 (23.6) |  |
Three-vessel coronary artery disease | Â | Â | 0.648 |
 Yes (%) | 375 (28.3) | 194 (29.3) |  |
 No (%) | 949 (71.7) | 468 (70.7) |  |
LAD stenosis (≥ 50%) |  |  | 0.346 |
Yes (%) | 1044 (78.9) | 534 (80.7) | Â |
No (%) | 280 (21.1) | 128 (19.3) | Â |
LCX stenosis (≥ 50%) |  |  | 0.775 |
 Yes (%) | 639 (48.3) | 315 (47.6) |  |
 No (%) | 685 (51.7) | 347 (52.4) |  |
RCA stenosis (≥ 50%) |  |  | 0.286 |
 Yes (%) | 777 (58.7) | 405 (61.2) |  |
 No (%) | 547 (41.3) | 257 (38.8) |  |
Hypertension | Â | Â | 0.773 |
 Yes (%) | 741 (56.0) | 375 (56.6) |  |
 No (%) | 583 (44.0) | 287 (43.4) |  |
Diabetes | Â | Â | 0.564 |
 Yes (%) | 293 (22.1) | 139 (21.0) |  |
 No (%) | 1031 (77.9) | 523 (79.0) |  |
Peripheral artery stenosis | Â | Â | 0.818 |
 Yes (%) | 290 (21.9) | 148 (22.4) |  |
 No (%) | 1034 (78.1) | 514 (77.6) |  |
Atrial fibrillation | Â | Â | 0.900 |
 Yes (%) | 90 (6.8) | 46 (6.9) |  |
 No (%) | 1234 (93.2) | 616 (93.1) |  |
Previous stroke | Â | Â | 0.275 |
 Yes (%) | 104 (7.9) | 43 (6.5) |  |
 No (%) | 1220 (92.1) | 619 (93.5) |  |
Kidney disease | Â | Â | 0.695 |
 Yes (%) | 55 (4.2) | 30 (4.5) |  |
 No (%) | 1269 (95.8) | 632 (95.5) |  |
Killip class | Â | Â | 0.356 |
 I (%) | 989 (74.7) | 485 (73.3) |  |
 II (%) | 187 (14.1) | 91 (13.7) |  |
 III (%) | 52 (3.9) | 23 (3.5) |  |
 IV (%) | 96 (7.3) | 63 (9.5) |  |
TIMI flow grades | Â | Â | 0.190 |
 I (%) | 91 (6.9) | 56 (8.5) |  |
 II (%) | 12 (0.9) | 11 (1.7) |  |
 III (%) | 45 (3.4) | 17 (2.6) |  |
 IV (%) | 1176 (88.8) | 578 (87.3) |  |
Previous cardiac arrest | Â | Â | 0.183 |
 Yes (%) | 58 (4.4) | 38 (5.7) |  |
 No (%) | 1266 (95.6) | 624 (94.3) |  |
Continuous variables | Â | Â | Â |
Age, year | 64.0 (54.0, 73.0) | 64.0 (53.0, 73.0) | 0.8513 |
Lactate, mmol/L | 2.80 (2.20, 3.70) | 2.80 (2.10, 3.70) | 0.687 |
BNP, pg/mL | 277.0 (103.0, 671.5) | 270.5 (109.0, 755.0) | 0.6686 |
Uric acid, μmol/L | 361.0 (300.0, 438.5) | 369.0 (305.0, 447.0) | 0.0871 |
LVEF, % | 48.0 (43.0, 55.8) | 49.0 (43.0, 55.0) | 0.9864 |
EGFR, mL/min/1.73Â m2 | 82.8 (61.0, 100.8) | 83.7 (58.8, 100.8) | 0.6192 |
Creatinine, μmol/L | 83.0 (71.0, 102.0) | 82.0 (70.0, 105.0) | 0.4397 |
Haemoglobin, g/L | 133.0 (120.0, 144.0) | 132.0 (119.0, 143.0) | 0.5253 |
MACE rate | Â | Â | Â |
6-month (%) | 42 (3.1) | 26 (3.9) | 0.3763 |
1-year (%) | 50 (3.8) | 27 (4.1) | 0.7573 |
4-year (%) | 186 (14.0) | 89 (13.4) | 0.7132 |