What is the value of IQ (Intelligence Quotience) indicating loss of autonomy in base living activities, like in preparing the food or in drug administration?
The only domain where IQ and better prognostic seem to be linked is in the case of ASD however IQ not related to autistic savant syndrome where some severely disabled people having ASD can have really exceptional talents based upon early predispositions in a narrow field such as drawing, and music in addition to early predispositions autistic savants have often received intensive artistic training as is the case with Derek Paravicini: a TED conference entitled "in the key of Genius Adam Ockleford Derek's mentor provides an excellent overview of Derek's story.
IQ is correlated with ADLs. However in the case of stroke or cerebral palsy it is the motor problems that would mainly affect ADL rather than cognitive abilities.
I should have said its the motor problems if that's mainly what the cp or stroke affected. If there is also a significant cognitive component then that would be could be as big a factor as the motor disorder.