I had a Dr pull that chart out. Those questions are pretty standard and not indicative of a "problem with the system." It's to get a feel for their current state and what their pain tolerance actually is. It's an extremely subjective thing you are trying to measure. There is only so much the Dr can asses about pain by observing the patient. Self-assessment is the primary source of info for pain diagnostics.
Do you people think other countries have a magic sensor the detects pain? *facepalm* Of course a spouse is going to want their partner to be in zero pain but cmon... you are assuming incorrectly about what that scale is for.