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Time trends of survival in groups of population densities. Time trends (2001–2013) of survival upon hospital arrival (A) and 30-day survival (B) in OHCA patients with associated 95% confidence intervals according to groups of population densities: low (<300/km2), medium (300–1499/km2), high (1500–2999/km2) and very high (>3000/km2). OHCA, out-of-hospital cardiac arrest.
