Table I.
Baseline characteristics.
| Prehospital ECG (N=19,690) | No Prehospital ECG (N=9,816) | |
|---|---|---|
| Demographics | ||
| Age (years)* | 60 (52-69) | 60 (52-71) |
| Male gender | 14,151 (71.9%) | 6,732 (68.6%) |
| Race/Ethnicity | ||
| White | 16,541 (84.0%) | 7,995 (81.5%) |
| Black | 1,759 (8.9%) | 1068 (10.9%) |
| Hispanic | 897 (4.6%) | 467 (4.8%) |
| Asian | 335 (1.7%) | 185 (1.9%) |
| Other/Missing | 158 (0.8%) | 101 (1.0%) |
| Insurance | ||
| Private/HMO | 11,339 (57.6%) | 5,426 (55.3%) |
| Medicare | 3,765 (19.1%) | 2,176 (22.2%) |
| Medicaid | 803 (4.1%) | 426 (4.3%) |
| Self-pay/None | 3,223 (16.4%) | 1,561 (15.9%) |
| Other | 560 (2.8%) | 227 (2.3%) |
| Medical History | ||
| Hypertension | 12,084 (61.4%) | 6,334 (64.5%) |
| Dyslipidemia | 10,531 (53.5%) | 5,311 (54.1%) |
| Diabetes mellitus | 4,068 (20.7%) | 2,252 (22.9%) |
| Prior MI | 3,769 (19.1%) | 2,039 (20.8%) |
| Home aspirin use | 6,092 (30.9%) | 3,190 (32.5%) |
| Presentation | ||
| Cardiac arrest† | 341 (3.9%) | 260 (7.2%) |
| Cardiogenic shock | 1,244 (6.3%) | 753 (7.7%) |
| During work hours | 7,728 (39.3%) | 3,503 (35.7%) |
| Geographic region | ||
| West | 3,110 (15.8%) | 920 (9.4%) |
| Northeast | 1,200 (6.1%) | 772 (7.9%) |
| Midwest | 4,537 (23.0%) | 3,107 (31.7%) |
| South | 10,843 (55.1%) | 5,017 (51.1%) |
*
Data presented as median (interquartile range)
†
Cardiac arrest was collected beginning in April 2011
MI=Myocardial infarction