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. Author manuscript; available in PMC: 2015 Aug 1.
Published in final edited form as: JAMA Intern Med. 2015 Feb 1;175(2):196–204. doi: 10.1001/jamainternmed.2014.5420

Figure 2. Kaplan-Meier Analysis of Survival After Cardiac Arrest by Ambulance Service Level.

Figure 2

The main plot shows survival probability during the first 90 days, and the inset shows survival probability over the full observational period. Survival analysis was based on cardiac arrests that occurred between January 1, 2009, and October 2, 2011. Mortality was observed until December 31, 2011, when the data were censored; thus, there was follow-up to at least 90 days for each beneficiary. ALS indicates advanced life support; BLS, basic life support.