Women have the added personal complication of miscarriages though on top possibly as well as being more attracted to the idea of keeping cats.
It's really interesting because new research is also suggesting one of the most important factors influencing schizophrenia is the fact that the person has travelled a fair bit and becuase they would have been experiencing new viruses doing this - points the finger at key mental health problems being caused by virus's and not genetic per se or a knock to the head etc.
I suppose what's interests about fairy tale witches is that while they always have a cat and are a bit crazy, they never have children ...
Perhaps black cats 'crossing' your path are unlucky after all ...
It's also possible that people who are careless about hygiene - partly cooked meat, not washing after cleaning litter trays - are the type of people more likely to commit suicide. Statistics, eh ?