Table 1.
Baseline characteristics of study participants
| All participants receiving ECG* (N=51,975) |
Participants at high risk of ACS (N=871) |
Participants with STEMI (N=303) |
|
|---|---|---|---|
| Age, mean (SD), y | 63 (17.9) | 63.6 (14) | 61.3 (12.3) |
| Male sex | 26,201 (50%) | 618 (71%) | 228 (75%) |
| Race | |||
| White | 724 (83%) | 267 (89%) | |
| Black | 94 (11 %) | 17 (6%) | |
| Native American | 16 (2%) | 7 (2%) | |
| Asian | 16 (2%) | 4 (1%) | |
| Native Hawaiian | 3 (0.3%) | 1 (0.3%) | |
| Other | 8 (1%) | 3 (1%) | |
| Hispanic ethnicity | 102 (12%) | 43 (14%) | |
| Chest pain primary complaint | 21,834 (44%) | 749 (86%) | 282 (93%) |
| Weekend | 13,676 (26%) | 243 (28%) | 94 (31%) |
| Overnight | 19,067 (37%) | 323 (37%) | 104 (34%) |
| Past Medical History | |||
| Myocardial infarction | 311 (36%) | 70 (23%) | |
| Coronary artery bypass grafting | 141 (16%) | 11 (4%) | |
| Congestive heart failure | 145 (17%) | 14 (5%) | |
| Cerebrovascular accident | 86 (10%) | 18 (6%) | |
| Percutaneous coronary intervention | 264 (30%) | 67 (22%) | |
| Diabetes mellitus | 242 (28%) | 61 (20%) |
Abbreviations: ECG, electrocardiogram; ACS, acute coronary syndrome; STEMI, ST-segment myocardial infarction
*
Data on race, ethnicity and past medical history not available for all participants receiving an out-of-hospital ECG