For the purposes of making measurements, i.e. quantifying human health, I can see the logic in using body, mind and spirit. But this is a westernised view of Homo Sapiens. In eastern traditions, the picture is different. Physical, subtle, causal and other bodies all feature in Eastern Mysticism.
While it is relatively easy to make measurements at the physical level, it becomes progressively more difficult to quantify the other levels. I guess an holistic or integrated view is an alternative starting point. There is, after all, a growing move towards the mind-body approach to medicine and there are many exponents of this. It doesn't stop us quantifying things at the physical level as these often reflect what is going on with our emotions, for example.
Just my initial thoughts.