Table 1 Baseline characteristics of the study population by age category (n = 3475)
| Â | Age category | |||
|---|---|---|---|---|
Variable | 25–64 years n = 1329 (38.2) | 65–74 years n = 1083 (31.2) | 75–84 years n = 1063 (30.6) | p Value |
Sociodemographics | ||||
 Age (years)a | 55 (49–60) | 70 (68–72) | 79 (77–81) | <0.0001 |
 Female sex | 251 (18.9) | 327 (30.2) | 500 (47.0) | <0.0001 |
 Marriedb | 885 (69.6) | 777 (75.6) | 607 (61.9) | <0.0001 |
 Living aloneb | 255 (20.1) | 189 (18.4) | 278 (28.4) | <0.0001 |
 Body mass index ≥30 kg/m2 | 413 (31.1) | 255 (23.6) | 183 (17.2) | <0.0001 |
 Smoker |  |  |  | <0.0001 |
  Current smoker | 714 (53.7) | 201 (18.6) | 74 (7.0) |  |
  Ex-smoker | 337 (25.4) | 403 (37.2) | 308 (29.0) |  |
  Never-smoker | 234 (17.6) | 391 (36.1) | 476 (44.8) |  |
  missing/not known | 44 (3.3) | 88 (8.1) | 205 (19.3) |  |
Medical historyc | ||||
 Prior MI | 181 (13.6) | 228 (21.1) | 244 (23.0) | <0.0001 |
 Prior stroke | 51 (3.8) | 117 (10.8) | 171 (16.1) | <0.0001 |
 Diabetes | 353 (26.6) | 439 (40.5) | 439 (41.3) | <0.0001 |
 Hypertension | 910 (68.5) | 885 (81.7) | 943 (88.7) | <0.0001 |
 Hyperlipidemia | 631 (47.5) | 538 (49.7) | 453 (42.6) | 0.004 |
 Angina pectoris | 135 (10.2) | 187 (17.3) | 210 (19.8) | <0.0001 |
 Chronic obstructive pulmonary disease | 50 (3.8) | 92 (8.5) | 92 (8.7) | <0.0001 |
Clinical characteristics | ||||
 Type of AMI |  |  |  | <0.0001 |
  STEMI | 625 (47.0) | 369 (34.1) | 298 (28.0) |  |
  NSTEM | 651 (49.0) | 603 (55.7) | 599 (56.4) |  |
  Bundle branch block | 53 (4.0) | 111 (10.2) | 166 (15.6) |  |
 Peak serum CPK level (U/l)a,b | 744 (265–1915) | 530 (212–1292) | 395 (173–991) | <0.0001 |
 LVEF |  |  |  | <0.0001 |
  > 30 % | 1141 (85.8) | 841 (77.7) | 711 (67.0) |  |
  ≤ 30 % | 73 (5.5) | 87 (8.0) | 123 (11.5) |  |
  not assessed/missing | 115 (8.7) | 155 (14.3) | 229 (21.5) |  |
 Renal dysfunctiond | 54 (4.1) | 159 (14.7) | 306 (28.8) | <0.0001 |
 Pre-hospital time/symptom onset to arrival (min)a | 159 (79–585) | 175 (77–613) | 188 (75–565) | 0.95 |