Clinical characteristics of enrolled patients (N=50)
| Female gender | 15 | 30% |
| White race | 18 | 36% |
| Triage code >2 | 39 | 78% |
| No past medical history* | 40 | 80% |
| Chronic obstructive pulmonary disease | 5 | 10% |
| Prior myocardial infarction | 5 | 10% |
| Admitted to hospital | 23 | 0.46 |
| Age (years) | 52 | SD 16 |
| Heart rate (beats/min) | 77 | SD 13 |
| Systolic BP (mm Hg) | 136 | SD 28 |
| SpO2 | 98 | SD 2 |
| Respiratory rate (breaths/min) | 21 | SD 9 |
*By patient report and medical record review.