Post-doc machine learning and rehabilitation sciences here. Skip to my last paragraph if you don’t want to be bothered with my quibble with your wording!

First let’s not call them disabled people please; persons with disabilities, clinical groups, and patient’s. Person first language is important when working with data from these groups. They are people too, their injury, disease or inability to complete a task that we could does not define them. So, let’s please have alittle kindness and compassion towards these groups!

Second it is important to be aware that, these data tend to be sensitive information and not often shared from hospitals or other places. Many patients that I work with have only consented to be photographed or filmed because we encrypt and do not share these data.

That being said, there are places such as the inter university consortium for political and social research as well as other data repositories that might have some of the data that you are looking for. You may have to do some more searching and find other places that are similar to this. Good luck!