Univariate analysis of the association between categorical variables and ACS
| Feature | With the feature (n/N (%)) | OR for ACS (95% CI) | p Value |
| Male sex | 895/1576 (56.7%) | 1.47 (1.01 to 2.13) | 0.044 |
| Nature of chest pain | |||
| Indigestion/burning | 135/1555 (8.7%) | 1.89 (0.85 to 4.23) | 0.119 |
| Stabbing/sharp | 311/1555 (20.0%) | 0.87 (0.40 to 1.88) | 0.715 |
| Aching/dull/heavy | 711/1555 (45.7%) | 1.27 (0.65 to 2.48) | 0.475 |
| Gripping/crushing | 232/1555 (14.9%) | 1.70 (0.81 to 3.56) | 0.159 |
| Non-specific/other | 166/1555 (10.7%) | Reference | – |
| Site of chest pain | |||
| Central | 1108/1564 (70.8%) | 0.90 (0.47 to 1.74) | 0.760 |
| Left chest | 308/1564 (19.7%) | 0.56 (0.25 to 1.22) | 0.145 |
| Right chest | 36/1564 (2.3%) | 0.26 (0.03 to 2.06) | 0.201 |
| Other | 110/1564 (7.0%) | Reference | – |
| Radiation of chest pain | |||
| None | 605/1534 (39.2%) | Reference | – |
| Left arm | 456/1534 (29.7%) | 1.43 (0.92 to 2.21) | 0.108 |
| Right arm | 39/1534 (2.5%) | 3.92 (1.75 to 8.79) | 0.001 |
| Neck | 78/1534 (5.1%) | 0.89 (0.34 to 2.33) | 0.821 |
| Jaw | 60/1534 (3.9%) | 0.69 (0.21 to 2.29) | 0.542 |
| Back | 174/1534 (11.3%) | 0.88 (0.44 to 1.75) | 0.719 |
| Other | 122/1534 (8.0%) | 1.69 (0.90 to 3.20) | 0.105 |
| Time of onset | |||
| 00:00–05:59 | 254/1409 (18.0%) | 1.06 (0.58 to 1.94) | 0.853 |
| 06:00–11:59 | 675/1409 (47.9%) | 0.74 (0.43 to 1.27) | 0.276 |
| 12:00–17:59 | 264/1409 (18.7%) | 0.93 (0.50 to 1.72) | 0.813 |
| 18:00–23:59 | 216/1409 (15.3%) | Reference | – |
| Continuous | 873/1303 (67.0%) | 0.98 (0.65 to 1.49) | 0.938 |
| Nausea | 489/1521 (32.1%) | 1.09 (0.74 to 1.60) | 0.667 |
| Vomiting | 92/1501 (6.1%) | 1.21 (0.59 to 2.47) | 0.603 |
| Sweating | 644/1521 (42.3%) | 1.18 (0.82 to 1.70) | 0.370 |
| Dyspnoea | 608/1507 (40.3%) | 0.94 (0.64 to 1.36) | 0.728 |
| Previous coronary heart disease | 196/1534 (12.8%) | 0.98 (0.57 to 1.70) | 0.950 |
| Diabetes | 94/1524 (6.2%) | 0.87 (0.39 to 1.92) | 0.731 |
| Hypertension | 459/1511 (30.4%) | 1.62 (1.12 to 2.34) | 0.011 |
| Hyperlipidaemia | 400/1418 (28.2%) | 1.17 (0.78 to 1.77) | 0.428 |
| Smoker | 478/1512 (31.6%) | 0.85 (0.57 to 1.28) | 0.443 |
| Ex-smoker | 207/1449 (14.3%) | 1.70 (1.07 to 2.69) | 0.025 |
| Cocaine use | 23/1445 (0.1%) | Not calculated* | 0.998 |
| Family history | 645/1422 (45.4%) | 0.80 (0.55 to 1.17) | 0.251 |
| Chest wall | 82/1367 (6.0%) | 0.58 (0.21 to 5.62) | 0.301 |
ACS, acute coronary syndrome; OR, odds ratio.
*No patient with cocaine use had ACS.