Leadsled,
Similar is not the same as "the same". The figures quoted by John McCormick are about the same as other and I have, which is about 30% fewer mid-airs in the US, compared to Australia.
The difference is big enough and consistent enough that it cannot be written off as a statistical error.
Those are pretty broad statments of fact. Care to share withn the rest of us unwashed on how you arrived at Aus being 30% more dangerous than the US. Simple ask, just a link to the website or publish some figures here that can be verifiable.
A list to make it easier-
Show us the stats, where, what website?
Then show the breakdown (separately for Australia and the US) of Mid-airs (and Airprox/NMAC's) by:-
1. Airspace category/service level
2. Collision pairs (IFR/IFR, and IFR/VFR, and VFR/VFR)
Simple answers to simple questions. Otherwise, Lies , Damn Lies and Statistics!