Both are also largely meaningless because they're based on BMI, which is literally just mass/height^2. No measure of percent body fat, no measure of any other aspect of health, just mass by the square of height.

If you're comparing the BMI of two countries with very similar gene pools it's not a bad point of comparison (though the raw number still doesn't tell you much without more context about build types), but when you're comparing Australia to the US the gene pools of the non-European minority groups are sufficiently different to make BMI pretty worthless as a point of comparison for public health.