Table 1 Baseline demographic and clinical characteristics of patients with first ST-segment elevation myocardial infarction by number of cardiovascular risk factors
Variables | Total (N = 16228) | No SMuRF (N = 1918) | 1–2 SMuRFs (N = 11503) | 3–4 SMuRFs (N = 2807) | P value |
|---|---|---|---|---|---|
Admission characteristics | |||||
 Age | 61.7 ± 12.5 | 64.9 ± 13.0 | 61.8 ± 12.6 | 59.3 ± 11.5 | <0.0001 |
  <55 | 4834 (30.0) | 436 (22.9) | 3387 (29.7) | 1011 (36.2) |  |
  55–74 | 8659 (53.8) | 1004 (52.6) | 6151 (53.9) | 1504 (53.9) |  |
  ≥75 | 2614 (16.2) | 467 (24.5) | 1873 (16.4) | 274 (9.8) |  |
 Male | 12381 (76.3) | 1318 (68.7) | 8799 (76.5) | 2264 (80.7) | <0.0001 |
 Education |  |  |  |  | <0.0001 |
  Illiterate | 1293 (8.0) | 232 (12.1) | 953 (8.3) | 108 (3.8) |  |
  Primary or secondary | 9073 (55.9) | 1052 (54.8) | 6471 (56.3) | 1550 (55.2) |  |
  High | 1348 (8.3) | 112 (5.8) | 955 (8.3) | 281 (10.0) |  |
  Unknown | 4514 (27.8) | 522 (27.2) | 3124 (27.2) | 868 (30.9) |  |
 Hospital class |  |  |  |  | <0.0001 |
  Province-level | 5256 (32.4) | 496 (25.9) | 3699 (32.2) | 1061 (37.8) |  |
  Prefecture-level | 8808 (54.3) | 1098 (57.2) | 6275 (54.6) | 1435 (51.1) |  |
  County-level | 2164 (13.3) | 324 (16.9) | 1529 (13.3) | 311 (11.1) |  |
 Smoking status |  |  |  |  | <0.0001 |
  Never | 7062 (43.5) | 1582 (82.5) | 4885 (42.5) | 595 (21.2) |  |
  Former | 1454 (9.0) | 336 (17.5) | 1020 (8.9) | 98 (3.5) |  |
  Current | 7712 (47.5) | 0 (0) | 5598 (48.7) | 2114 (75.3) |  |
 Hypertension | 7887 (48.6) | 0 (0) | 5426 (47.2) | 2461 (87.7) | <0.0001 |
 Diabetes | 4312 (26.6) | 0 (0) | 2392 (20.8) | 1920 (68.4) | <0.0001 |
 Hyperlipidemia | 6060 (37.4) | 0 (0) | 3738 (32.5) | 2322 (82.7) | <0.0001 |
 Weight, kg | 68.1 ± 10.9 | 64.4 ± 10.5 | 67.9 ± 10.7 | 71.3 ± 11.2 | <0.0001 |
 Body mass index, kg/m2 | 24.1 ± 3.1 | 23.2 ± 3.0 | 24.1 ± 3.1 | 25.0 ± 3.3 | <0.0001 |
Medical history | |||||
 Family history of coronary artery disease | 562 (3.5) | 34 (1.8) | 370 (3.2) | 158 (5.6) | <0.0001 |
 Heart failure | 114 (0.7) | 11 (0.6) | 82 (0.7) | 21 (0.7) | 0.76 |
 Stroke | 1399 (8.6) | 95 (5.0) | 1022 (8.9) | 282 (10.1) | <0.0001 |
 Peripheral arterial disease | 61 (0.4) | 5 (0.3) | 41 (0.4) | 15 (0.5) | 0.26 |
 Chronic renal failure | 112 (0.7) | 8 (0.4) | 83 (0.7) | 21 (0.8) | 0.30 |
 Chronic obstructive pulmonary disease | 271 (1.7) | 45 (2.4) | 187 (1.6) | 39 (1.4) | 0.03 |
Pre-hospital pharmacotherapy | |||||
 Aspirin | 937 (5.8) | 38 (2.0) | 594 (5.2) | 305 (10.9) | <0.0001 |
 P2Y12 inhibitor | 318 (2.0) | 15 (0.8) | 195 (1.7) | 108 (3.9) | <0.0001 |
 Statin | 942 (5.9) | 0 (0) | 522 (4.6) | 420 (15.2) | <0.0001 |
 β-blocker | 518 (3.2) | 0 (0) | 303 (2.7) | 215 (7.8) | <0.0001 |
 ACEI/ARB | 763 (4.8) | 0 (0) | 470 (4.2) | 293 (10.6) | <0.0001 |