Seeing how many people have read this and no answers have come up, and I haven't one either, I'm wondering why you are seaching for statistics on such an open ended, never ending question. Is it possible to narrow and specify your interest into an area where research has maybe some answers? I'm a neuro physio with lots of practice but no research post. My statistics say all stroke patients will have functional difficulties sometime. The spectrum will be from immediate post stroke acute to long time functional problems due to various reasons. Where do you want to start? The Parkinson patients have progessive worsening over years and MS as well, with many many variations of presentation of their pathologies. I would say 100% have dexterity problems sometime and therefore 100% will have ADL problems. ADL problems in which specific tasks?? Again, a big variation. Maybe focus your question differently if you are doing some research in a specific area to enable some answers. Good luck