I've calculated the same figures before but didn't publish them as location on aircraft had a more significant cause/effect relationship than own seat/not. As for the flight attendant who has made a crusade due to the one that didn't make it, I understand, for her it's personal and emotional vs fact/statistic based. I try not to argue with emotional people as no matter what facts are presented, they rarely consider anything beyond their emotions. This isn't to say that o think seat belts and individual seats/car seats are a bad idea, just that the most vocal person in the recent past on this topic has a view biased by personal experience.