Baseline characteristics and differences in EMS delay times and 30-day mortality
| Frequency | EMS delay time >60 min | 30-day mortality | |||
| n (%) | n (%) | P value | n (%) | P value | |
| Age, years | 0.006 | <0.001 | |||
| <55 | 809 (27.2) | 374 (46.3) | 45 (5.6) | ||
| 55–64 | 886 (29.8) | 435 (49.2) | 45 (5.1) | ||
| 65–74 | 702 (23.6) | 339 (48.3) | 60 (8.6) | ||
| ≥75 | 579 (19.5) | 322 (55.6) | 84 (14.5) | ||
| Sex | 0.005 | 0.011 | |||
| Male | 2389 (80.3) | 1150 (48.2) | 173 (7.2) | ||
| Female | 587 (19.7) | 320 (54.6) | 61 (10.4) | ||
| Previous revascularisation | 0.5 | 0.064 | |||
| No | 2573 (86.5) | 1277 (49.7) | 193 (7.5) | ||
| Yes | 403 (13.5) | 193 (48.0) | 41 (10.2) | ||
| Diabetes | 0.4 | 0.006 | |||
| No | 2525 (84.9) | 1255 (49.7) | 184 (7.3) | ||
| Yes | 451 (15.2) | 215 (47.8) | 50 (11.1) | ||
| Peripheral vascular disease | 0.4 | 0.004 | |||
| No | 2921 (98.1) | 1440 (49.3) | 224 (7.7) | ||
| Yes | 55 (1.9) | 30 (55.6) | 10 (18.2) | ||
| Cerebrovascular disease | 0.2 | 0.008 | |||
| No | 2875 (96.6) | 1414 (49.2) | 219 (7.6) | ||
| Yes | 101 (3.4) | 56 (55.5) | 15 (14.9) | ||
| Chronic oral anti-coagulant therapy | 0.2 | <0.001 | |||
| No | 2899 (97.4) | 1426 (49.2) | 218 (7.5) | ||
| Yes | 77 (2.6) | 44 (57.1) | 16 (20.8) | ||
| Cardiogenic shock | <0.001 | <0.001 | |||
| No | 2624 (88.2) | 1211 (46.2) | 89 (3.4) | ||
| Yes | 352 (11.8) | 259 (74.2) | 145 (41.2) | ||
| OHCA | <0.001 | <0.001 | |||
| No | 2593 (87.1) | 1160 (44.8) | 112 (4.3) | ||
| Yes | 383 (12.9) | 310 (81.2) | 122 (52.1) | ||
| Anterior infarction | 0.013 | <0.001 | |||
| No | 1693 (56.9) | 803 (47.5) | 107 (6.3) | ||
| Yes | 1281 (43.1) | 667 (52.1) | 127 (9.9) | ||
| Prehospital 12-lead ECG | <0.001 | 0.002 | |||
| Not taken | 747 (25.1) | 276 (37.0) | 72 (9.6) | ||
| Taken | 772 (26.0) | 416 (53.9) | 74 (9.6) | ||
| Taken and transmitted | 1454 (48.9) | 778 (53.5) | 88 (6.1) | ||
| MICA on scene | <0.001 | <0.001 | |||
| No | 671 (22.5) | 220 (32.9) | 30 (4.5) | ||
| Yes | 2305 (77.5) | 1250 (54.2) | 205 (8.9) | ||
| Time of call (off-hours) | 0.8 | 0.8 | |||
| Work-hours | 1519 (51.0) | 747 (49.2) | 118 (7.8) | ||
| off-hours | 1457 (49.0) | 723 (49.7) | 116 (8.0) | ||
| Day of call (weekends) | 0.7 | 0.8 | |||
| Weekdays | 2132 (71.6) | 1058 (49.7) | 166 (7.8) | ||
| Weekends | 844 (28.4) | 412 (48.8) | 68 (8.1) | ||
| Patient delay time | 0.02 | <0.001 | |||
| <30 | 1356 (45.6) | 702 (51.8) | 156 (11.5) | ||
| >30 | 1620 (54.4) | 768 (47.5) | 78 (4.8) | ||
| EMS delay time | <0.001 | ||||
| <60 | 1503 (50.6) | -- | 66 (4.4) | ||
| >60 | 1470 (49.4) | -- | 167 (11.4) | ||
| DTB time | 0.003 | <0.001 | |||
| <60 | 1458 (49.0) | 762 (52.3) | 71 (4.9) | ||
| >60 | 1518 (51.0) | 708 (46.7) | 163 (10.7) | ||
DTB, door-to-balloon; EMS, emergency medical service; MICA, mobile intensive care ambulance; OHCA, out-of-hospital cardiac arrest.