Characteristics of all cases with a STEMI diagnosis according to the ambulance service initial clinical impressions and method of transport to hospital
| Ambulance initial clinical impression | |||||||||
| Suspected STEMI | Other suspected ACS | ACS not suspected | P value | P value | P value | All transported by ambulance | Self-presented | P value | |
| (n=2016) | (n=792) | (n=1181) | (1 vs 2) | (1 vs 3) | (2 vs 3) | (n=3989) | (n=1476) | ||
| Age (years), mean (SD) | 66.4 (13.5) | 68.4 (13.9) | 72.7 (14.5) | 0.001 | <0.001 | <0.001 | 68.6 (14.1) | 64.3 (13.5) | <0.001 |
| Age group, n (%) | 0.009 | <0.001 | <0.001 | <0.001 | |||||
| <45 | 106 (5.3) | 30 (3.8) | 40 (3.4) | 176 (4.4) | 88 (6.0) | ||||
| 45–54 | 281 (13.9) | 107 (13.5) | 108 (9.1) | 496 (12.4) | 270 (18.3) | ||||
| 55–64 | 534 (26.5) | 176 (22.2) | 186 (15.7) | 896 (22.5) | 391 (26.5) | ||||
| 65–74 | 501 (24.9) | 199 (25.1) | 263 (22.3) | 963 (24.1) | 381 (25.8) | ||||
| 75–84 | 393 (19.5) | 171 (21.6) | 299 (25.3) | 863 (21.6) | 238 (16.1) | ||||
| 85+ | 201 (10.0) | 109 (13.8) | 285 (24.1) | 595 (14.9) | 108 (7.3) | ||||
| Female, n (%) | 634 (31.4) | 271 (34.2) | 514 (43.5) | 0.158 | <0.001 | <0.001 | 1419 (35.6) | 440 (29.8) | <0.001 |
| Ethnicity, n (%) | 0.971 | <0.001 | <0.001 | <0.001 | |||||
| Māori | 184 (9.1) | 76 (9.6) | 150 (12.7) | 410 (10.3) | 232 (15.7) | ||||
| Pacific | 80 (4.0) | 29 (3.7) | 83 (7.0) | 192 (4.8) | 85 (5.8) | ||||
| Indian | 86 (4.3) | 35 (4.4) | 30 (2.5) | 151 (3.8) | 84 (5.7) | ||||
| Other Asian | 79 (3.9) | 28 (3.5) | 29 (2.5) | 136 (3.4) | 74 (5.0) | ||||
| European/other | 1587 (78.7) | 624 (78.8) | 889 (75.3) | 3100 (77.7) | 1001 (67.8) | ||||
| NZDep13, n (%) | 0.74 | 0.536 | 0.986 | 0.094 | |||||
| 1–2 (least deprived) | 327 (16.2) | 124 (15.7) | 173 (14.6) | 624 (15.6) | 224 (15.2) | ||||
| 3–4 | 375 (18.6) | 135 (17.0) | 194 (16.4) | 704 (17.6) | 251 (17.0) | ||||
| 5–6 | 385 (19.1) | 140 (17.7) | 210 (17.8) | 735 (18.4) | 232 (15.7) | ||||
| 7–8 | 452 (22.4) | 164 (20.7) | 248 (21.0) | 864 (21.7) | 291 (19.7) | ||||
| 9–10 (most deprived) | 439 (21.8) | 184 (23.2) | 273 (23.1) | 896 (22.5) | 365 (24.7) | ||||
| Missing | 38 (1.9) | 45 (5.7) | 83 (7.0) | 166 (4.2) | 113 (7.7) | ||||
| Non-cardiac Charlson score | <0.001 | <0.001 | <0.001 | 0.074 | |||||
| 0 | 1551 (76.9) | 541 (68.3) | 619 (52.4) | 2711 (68.0) | 1043 (70.7) | ||||
| 1–2 | 326 (16.2) | 160 (20.2) | 302 (25.6) | 788 (19.8) | 252 (17.1) | ||||
| 3+ | 139 (6.9) | 91 (11.5) | 260 (22.0) | 490 (12.3) | 181 (12.3) | ||||
| Hospital status, n (%) | <0.001 | <0.001 | 0.404 | 0.892 | |||||
| Primary PCI centre | 1408 (69.8) | 506 (63.9) | 735 (62.2) | 2649 (66.4) | 987 (66.9) | ||||
| Non-primary PCI centre | 551 (27.3) | 241 (30.4) | 389 (32.9) | 1181 (29.6) | 428 (29.0) | ||||
| Rural hospital without cath lab | 57 (2.8) | 45 (5.7) | 57 (4.8) | 159 (4.0) | 61 (4.1) | ||||
| System time, median (IQR) | 54.6 (42.1–74.0) | 54.0 (40.8–71.5) | 59.3 (44.3–80.7) | 0.218 | <0.001 | <0.001 | 55.8 (42.4–75.9) | – | – |
| Coronary intervention status | |||||||||
| No cath | <0.001 | <0.001 | <0.001 | 0.512 | |||||
| Cath with intervention | 270 (13.4) | 177 (22.3) | 627 (52.7) | 1074 (26.9) | 381 (24.7) | ||||
| Cath without intervention | 1574 (78.1) | 514 (64.9) | 417 (35.3) | 2505 (62.8) | 930 (64.3) | ||||
| 172 (8.5) | 101 (12.8) | 137 (11.6) | 410 (10.3) | 165 (11.0) | |||||
ACS, acute coronary syndrome; cath, catheterisation; NZDep13, New Zealand Deprivation Index 2013; PCI, percutaneous coronary intervention; STEMI, ST-segment elevation myocardial infarction.