Table 1.

Baseline characteristics of the index and validation cohorts

Variables	Index cohort n=1208	Validation cohort n=435
Age, years (SD)	65.7±13.6	65.0±14.8
Male sex (%)	642 (53.1)	224 (51.5)
HR, bpm (SD)	91.9±19.4	94±20.3
Systolic blood pressure, mm Hg (SD)	154.2±29.8	153.6±27.0
Diastolic blood pressure, mm Hg (SD)	89.1±19.2	88.6±18.4
Event-time-to-troponin, hours (SD)	5.8±8.8	4.0±5.4
HEART Score, median (IQR)	5 (3)	5 (3)
HISTORY, score 0 (%)	512 (42.6)	204 (46.9)
HISTORY, score 1 (%)	402 (33.5)	143 (32.9)
HISTORY, score 2 (%)	287 (23.9)	88 (20.2)
ECG, score 0 (%)	522 (43.5)	202 (46.4)
ECG, score 1 (%)	511 (42.5)	170 (39.1)
ECG, score 2 (%)	168 (14.0)	63 (14.5)
AGE, score 0 (%)	77 (6.4)	36 (8.3)
AGE, score 1 (%)	441 (36.7)	164 (37.7)
AGE, score 2 (%)	683 (56.9)	235 (54.0)
RISK, score 0 (%)	163 (13.6)	46 (10.6)
RISK, score 1 (%)	383 (31.9)	137 (31.5)
RISK, score 2 (%)	665 (54.5)	252 (57.9)
TROPONIN, score 0 (%)	1041 (86.7)	357 (82.1)
TROPONIN, score 1 (%)	54 (4.5)	25 (5.7)
TROPONIN, score 2 (%)	106 (8.8)	53 (12.2)

HEART, history, ECG, age, risk factors and troponin; HR, heart rate.;