Table 1.

Study Sample Characteristics

Characteristic	Overall Cohort [n=2584]	30-Day Serious Event [n=173]	No 30-Day Serious Event [n=2411]	Missing Data
Demographics
Age*
60–69	32%	22%	33%
70–79	38%	38%	38%
80–89	26%	32%	26%
>90	4%	9%	4%
Male*	46%	59%	41%
Non-White*	20%	12%	21%	7%
Hispanic	12%	10%	12%	7%
Co-Morbidities
Coronary Artery Disease	22%	25%	21%
Congestive Heart Failure**	9%	17%	8%
Ejection Fraction <40%*	1%	6%	1%
Aortic Stenosis	1%	1%	1%
Arrhythmia*	13%	30%	12%
Pacemaker/AICD	5%	8%	5%
Stroke	15%	20%	15%
Prior Syncope in 30 Days	2%	2%	2%
Diabetes	20%	23%	20%
Hypertension	61%	61%	62%
Dementia	9%	13%	9%
Symptoms
Near-Syncope*†	31%	20%	32%
Chest Pain	7%	11%	7%	16%
Shortness of Breath	8%	13%	7%	32%
No Prodromal Symptoms**	16%	23%	16%	13%
Physical Exam
Triage Vital Signs
HR<60**	18%	17%	17%	11%
HR 60–100	73%	70%	76%
HR>100	7%	13%	7%
SBP<90	2%	3%	2%	11%
SBP 90–160	78%	72%	78%
SBP>160	20%	26%	19%
Cardiac Murmur	11%	14%	11%	12%
Abnormal Neurologic Exam	4%	6%	4%	15%
Major Traumatic Injury*	4%	8%	3%
Tests
Abnormal ECG*	51%	71%	50%	5%
Non-sinus Rhythm*	11%	10%	26%
ST/T Changes*	23%	23%	32%
Abnormal Intervals*	8%	8%	16%
Ventricular Hypertrophy	10%	9%	12%
Left Axis Deviation	14%	14%	15%
Left Bundle Branch Block	4%	4%	4%
Right Bundle Branch Block	7%	7%	11%
Hematocrit<30	5%	5%	5%	14%
Pyuria	7%	5%	7%
Abnormal Troponin*	11%	25%	10%	30%
Admitted*‡	43%	86%	40%

^*Comparison between serious event and no-serious event groups: p<0.01

^**Comparison between serious event and no-serious event groups: p<0.05

^†Compared to Syncope

^‡Weighted estimate- see methods section