I would just add that the same can be said for virtually all the other neurodevelopmental disabilities that affect children. We do not have precise numbers for anything in Canada. There are some numbers we could get, like how many children were born with Down's syndrome last year, because all children with Down's Syndrome have a chromosome anomaly and that is assessed in genetics laboratories. But we don't know the prevalence of epilepsy, or the prevalence of cerebral palsy, or the prevalence of autism, or the prevalence of Tourette's syndrome because we don't have systems to collect that and we don't have clear definitions, as has been said repeatedly.
On December 14th, 2010. See this statement in context.