Patients without symptom assessment N=260 (%)	Patients with symptom assessment N=839 (%)	P value
Demographic Data
Age — yr
Mean(SD)	54.1(7)	52.6(8)	0.04
Male Sex — no.	194 (74.6)	631 (75.2)	0.85
Timing — no.			0.15
Night (midnight to 06:00 am)	14 (14.3)	61 (14.5)
Morning (6:00 am to 12:00 pm)	25 (25.5)	123 (29.3)
Afternoon (12:00 pm to 6:00 pm)	39 (39.8)	119 (28.3)
Evening (6:00pm to midnight)	20 (20.4)	117 (25.9)
Missing	162	419
≥2 Known Cardiovascular Risk Factor	139 (54.9)	433 (51.9)	0.39
Missing	7	4
Known Heart Disease — no.	95 (36.5)	301 (35.9)	0.85
Coronary artery disease	53 (20.4)	198 (23.6)	0.28
≥2 Known Cardiovascular Risk Factor and/or Heart Disease — no.	167 (64.2)	526 (62.7)	0.65
Coronary Artery Disease-related SCA* — no.	111 (79.9)	458 (80.5)	0.08
Missing	121	279
Home Occurrence — no.	162 (62.8)	586 (70.2)	0.03
Missing	2	4
Witnessed status—
No witness	168 (65.4)	361 (43.3)	<0.001
Witnessed without CPR	58 (22.6)	301 (36.1)
Witnessed with CPR	31(12.1)	172 (20.6)
Missing	3	5
Call-to-EMS Arrival — Mean(SD), Min	6.9(3)	6.9(4)	0.80
Missing	91	296
Rhythm — no.			0.56
Ventricular fibrillation/tachycardia	78 (44.1)	312 (50.2)	0.15
Missing	83	218