I think that if we look not in that book but the other book, of Pascale Brillon, she's reported a few studies. You could have percentages, but it varies in studies. After being exposed to a trauma, there is about a 15% chance of developing post-traumatic stress disorder, whether you're in the military or not. I think, if I remember correctly, she points out a few traits, so there must be something out there, but I'm not sure.
The StatsCanada study has not looked into that, but they took a very good sample, which is 5,000 people, but of the 5,000 people, how many were from the navy, the air force, and the army? This is another thing that I would just point out. If the 5,000 are from the army, maybe the numbers would be different now.