Study areas, population densities, and distributions of out-of-hospital cardiac arrests (OHCA) cases and hospitals in Kaohsiung, 2011–2013.

<p>Purple points indicate that patients with OHCA were transported to the closest emergency hospital while green points represent bypassing it.</p

Interpolation of the interval from the call to hospital admission by using the Kriging method.

<p>Areas marked with red indicate a prolonged interval of an out-of-hospital cardiac arrest (OHCA) case from the call to hospital admission, while areas marked with green show a short interval (<30 min). Uncolored areas are locations without sufficient interpolation information (sparse OHCA event points).</p

Flow chart of the study design.

<p>Abbreviations: CPR: cardiopulmonary resuscitation; AED: automated external defibrillator; LMA: laryngeal mask airway.</p

Survival percentages of out-of-hospital cardiac arrests (OHCA) by district in areas with high (> = 5,000 persons/km²) and low (< 5,000 persons/km²) population densities of Kaohsiung City, 2011–2013.

<p>Survival percentages of out-of-hospital cardiac arrests (OHCA) by district in areas with high (> = 5,000 persons/km²) and low (< 5,000 persons/km²) population densities of Kaohsiung City, 2011–2013.</p