It can be caused by psychological difficulties, inability to toilet-train or a genetic abnormality present at birth, among other things.
Many parents feel the percentage is MUCH higher.
In Nova Scotia alone, more than 300 children are, specifically, treated for this condition each year. There's more to it than that, though. The embarrassment, loss of self esteem and loss of friends causes a child's ego to suffer far more than might be imagined. What is even more tragic is the lack of support for these families. My wife and I would like to see a support group for these children and their families, in every area .