Table 2.

 Mortality one month after cardiac arrest in univariate analysis

Factor	Survival rate	p Value	OR	95% CI
Age (years)
>Median	0.7%	<0.0001	2.22	1.61 to 3.11
⩽Median	1.4%
Sex
Male	1.0%	>0.2	1.09	0.78 to 1.50
Female	1.1%
Cause
Cardiac	0.9%	0.011	1.53	1.11 to 2.10
Non-cardiac	1.4%
Place where arrest occurred
At home	0.6%	<0.0001	3.21	2.37 to 4.38
Other	2.0%
Bystander witnessed arrest
Yes	1.3%	<0.0001	2.12	1.49 to 3.06
No	0.6%
Interval between call for and arrival of ambulance (mins)
⩽Median	1.6%	<0.0001	4.4	2.92 to 6.80
>Median	0.4%
Interval between collapse and call for ambulance (mins)
⩽Median	1.8%	0.0001	2.48	1.57 to 4.00
>Median	0.6%
Bystander CPR
Yes	1.6%	<0.0001	2.14	1.57 to 2.92
No	0.8%

CI, confidence interval; OR, odds ratio.