'Toe-Walking' More Common in Kids With Mental Woes: Study

So apparently there is a link between autism and walking on your toes as a kid...but there are some references to this with childhood sz as well so now I'm wondering how common this. The rate for the general population is 5% vs 40% in autism. I don't have numbers of sz and psychosis because the paper was from 1958 thus not electronic...anyway just curious....I totally used to do this then my parents broke me of it and when I has issues with balance and had to learn to walk again at 12 I did the toe walking thing again....I still do it to some extent.