I don't know the numbers for Australia since we don't have the same healthcare issues, but there are a lot of studies in the US that have said that: this articl

I don't know the numbers for Australia since we don't have the same healthcare issues, but there are a lot of studies in the US that have said that: this article contains several examples http://www.motherjones.com/politics/2015/02/housing-first-solution-to-homelessness-utah http://www.motherjones.com/politics/2015/02/housing-first-so...