I offer a small snapshot. I keep a level 3 doctor the past two seasons. After very few injuries in season 8, so far i have 2 injuries in season 9. They are suffered by the same player, so the other 12 guys are free and healthy. The injured player missed 3 weeks and is 35 years old.
One and a half seasons is a very small sample. I wouldn't base any conclusions off of it. As I've pointed out before, you can get unlucky sometimes and other times be very unlucky.
I had another injury in my last game. I think it is pushing 3 weeks now where I'm averaging an injury per game. ;-)
Run of the Mill Canadian Manager