The reference group is usually the general population in your age group, sometimes normalized for educational background. Your scores sound like mine except mine were even lower. I can understand why you are struggling.

It is very difficult to compare injuries. As the saying goes, If you've seen one head injury, you've seen ONE head injury. There may be some similarities in symptoms but there is a wide range of recovery times.

It sounds like UPMC is on top of the issues.

My best to you.