Table 4.

Odds ratios of variables known to affect outcome from cardiac arrest, and the odds ratio of chest compression rate by category. The reference rate category is 80 to 140 compressions/minute.

	ROSC OR (95% CI)*	P-Value	Survival to Discharge OR (95% CI)*	P-Value
Chest compression rate, categories
Unadjusted Model
0–80 compressions/min	1.12 (0.77,1.62)	0.57	1.24 (0.69,2.24)	0.47
80–140 compressions/min	Reference		Reference
140+ compressions/min	0.79 (0.58,1.072)	0.13	0.51 (0.27,0.98)	0.04
Adjusted Model †
0–80 compressions/min	1.18 (0.78,1.79)	0.79	1.32 (0.67,2.62)	0.42
80–140 compressions/min	Reference		Reference
140+ compressions/min	1.01 (0.72,1.41)	0.96	0.61 (0.29,1.25)	0.18
Global test for chest compression rate categories	vs ROSC	0.73	vs Survival	0.25
Male sex	0.72 (0.60,0.86)	<0.001	0.83 (0.60,1.17)	0.29
Age (10-year increase)	0.96 (0.91,1.01)	0.1	0.77 (0.71,0.84)	<0.001
Bystander witnessed arrest	2.05 (1.71,2.47)	<0.001	2.18 (1.54, 3.09)	<0.001
EMS witnessed arrest	2.04 (1.39, 2.98)	<0.001	3.18 (1.68, 6.02)	<0.001
Bystander CPR	0.93 (0.78, 1.11)	0.41	1.15 (0.85, 1.56)	0.36
Public location	1.25 (1.01, 1.55)	0.04	1.83 (1.34, 2.50)	<0.001
Rhythm
VT/VF	Reference		Reference
PEA	0.43 (0.34,0.54)	<0.001	0.22 (0.15,0.32)	<0.001
Asystole	0.22 (0.17, 0.27)	<0.001	0.04 (0.02, 0.07)	<0.001
AED – no shock advised	0.30 (0.17, 0.52)	<0.001	0.07 (0.01, 0.52)	0.01
Can’t Determine	0.59 (0.31, 1.12)	0.11	0.24 (0.07, 0.85)	0.03

^*OR, odds ratio; CI, confidence interval; ROSC, return of spontaneous circulation; EMS, emergency medical services; CPR, cardiopulmonary resuscitation; VT, ventricular tachycardia; VF, ventricular fibrillation; PEA, pulseless electrical activity; AED, automated external defibrillator.

^†Model includes sex, age, bystander witnessed arrest, EMS witnessed arrest, first known EMS rhythm, attempted bystander CPR, public location, and site location. The number of patients in each category of compressions/min are: <80/min, n = 122 (3.9%); 80 – 140/min, n = 2,763 (89.2%; >140/min, n = 213 (6.9%).