There isn't good data in Canada on the cost. That's something that's not known in Canada, and it would be very helpful to have a better understanding.
Most of the studies are from the U.S. and Europe, and the estimates are millions of dollars in cost to society, in the form of loss of productivity but also health care costs. People with PTSD often have co-occurring physical health issues, and often access a lot of physical health services as well as mental health services.