In my first aid course we were taught that the speed in which an AED is applied is the main contributing factor. Giving that most workplaces/homes/restaurants ...etc don't actually have an AED you would normally get one when the ambulance arrives.
Someone in the NHS had worked out the graph for distance from ambulance and % survival. He gave us all our % chance survival if our office didn't have and AED based upon the average rate from our work places and that we needed to wait for the ambulance. This was under the assumption that someone would start CPR almost straight after the arrest.
In our office this % without an AED was < 10% something insane like 6% chance survival. With an AED survival is much higher. He gave the figure of 95%+ survival rate for offices that had AED in them.
I brought this up in a company meeting with all staff there and the question was how much is an AED. I had already asked this and it was £750 for an older second hand one and £1100 for a brand new one.
Never bought the flipping AED.
So from what I made out my life was worth < £750 to the CEO.