Great result! Well done to all involved.
Regarding CPR statistics, don't believe the numbers. As a volunteer fireman/first responder, we are told to ignore the numbers and do our best in all circumstances. Yes, we are informed that the chance of survival in a hospital is better than in an urban environment, and even better than in rural situations to which I respond. Improvement in survival is mainly due to the speed of our response and AED. However, we are also told that the cause of the event is the major influencer. For example, the chance of recovery is far worse for an age related medical event such as cardiac arrest, even with swift medical attention, compared to accident events like drowning or electric shock, especially if a young person. So, the moral here is to ignore the numbers, do your best, hope for a miracle, but don't beat yourself up if it "fails". Importantly, know that you have done nothing wrong if you gave it your all.