Table 3.

Logistic regression results.

	Model 1: All treated cases n = 44,666		Model 2: Presumed cardiac etiology cases n = 41,950
	OR	95% CI	OR	95% CI
2006	Reference		Reference
2007	1.29	(1.14, 1.46)	1.25	(1.10, 1.43)
2008	1.39	(1.23, 1.58)	1.40	(1.22, 1.59)
2009	1.29	(1.14, 1.47)	1.29	(1.13, 1.48)
2010	1.72	(1.53, 1.94)	1.73	(1.53, 1.96)
Age < 40	Reference		Reference
Age 40–60	0.76	(0.67, 0.86)	0.76	(0.66, 0.88)
Age > 60	0.47	(0.41, 0.53)	0.47	(0.41, 0.54)
Female	Reference		Reference
Male	0.89	(0.83, 0.96)	0.90	(0.84, 0.98)
Arrival time <6 min	Reference		Reference
Arrival time ≥ 6 min	0.73	(0.67, 0.79)	0.71	(0.66, 0.77)
Not witnessed	Reference		Reference
EMS witnessed	5.48	(4.85, 6.21)	5.88	(5.17, 6.69)
Bystander witnessed	2.49	(2.27, 2.74)	2.44	(2.21, 2.70)
No bystander CPR	Reference		Reference
Bystander CPR	1.20	(1.10, 1.30)	1.24	(1.13, 1.35)
Public location	1.85	(1.70, 2.01)	1.86	(1.71, 2.03)
Initial rhythm: asystole	Reference		Reference
Initial rhythm: VT/VF	13.73	(12.10, 15.57)	13.30	(11.70, 15.20)
Initial rhythm: PEA	3.07	(2.67, 3.54)	2.81	(2.42, 3.26)
Presumed cardiac etiology	Reference		N/A	N/A
Non-cardiac etiology	1.47	(1.25, 1.72)	N/A	N/A