The 30% figure is in my head from a project in Seattle in the early 80's where there was a push to qualify everyone in basic CPR - undoubtedly that represents a very best case scenario.
I heard that O'Hare Airport in Chicago used to be heart attack central in the 1980s. It was one of the world's busiest airports, with plenty of overweight, under-exercised, stressed-to-the-brink businessmen traveling through. Supposedly they had close to 1,000 heart attacks per year. The airport was able to reduce the number of deaths substantially by installing AED throughout the airport and by training the staff in the use of AED and CPR.
Can anyone confirm/elaborate on this?
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