The study said > About 15 per cent had a mental illness before becoming homeless, while slightly more, 16 per cent, developed a disorder while on the street.

The study said > About 15 per cent had a mental illness before becoming homeless, while slightly more, 16 per cent, developed a disorder while on the street. If they were suffering from schizophrenia but it was controlled with treatment they would fall into the category of "had a mental illness before becoming homeless", not "developed a disorder while on the street".