http://www.history.com/news/history-lists/10-things-you-may-not-know-about-roman-gladiators http://www.history.com/news/history-lists/10-things-you-may-... #1

http://www.history.com/news/history-lists/10-things-you-may-not-know-about-roman-gladiators http://www.history.com/news/history-lists/10-things-you-may-... #1 talks about how free vs slave gladiators changing over time. Most interesting to me was #3, where it talks about how most were not killed but wounded instead. "historians have estimated that somewhere between one in five or one in 10 bouts left one of its participants dead."