True, but our line of thinking was as follows:
a lot of MS patients do not see their neuro regularly, so a 0 measurement would be difficult to schedule with a neuro, let alone the monthly follow ups.
Most pwMS have some sort of fysiotherapy in order to cope with their fysical problems, so this measurement is at closehand.
Most liberated pwMS report on "feelings" that spasms have declined, walking is slightly better etc. Those are all subjective measurements, this gives an objective measure.
My fysio is specialised in neurological disabilities, so this might well be a specific list for these disorders.