Figure 4From: Developing an analytical tool for evaluating EMS system design changes and their impact on cardiac arrest outcomes: combining geographic information systems with register data on survival ratesNumber of inhabitants of the County of Stockholm reached by emergency responder (fire services and/or ambulance) per time interval (minutes). Notes: The data has to be adjusted by adding the remainder of the alarm process ( i.e. + 5 minutes) to capture the full picture.Back to article page