It's too early in B.C. to measure the health outcome, because the transfer occurred in 2013, operationally. However, we have seen evidence from self-governing arrangements in other parts of the country where increased control has led to better results.
Evidence of meeting #13 for Indigenous and Northern Affairs in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was nurses.
A video is available from Parliament.