Susan Hamburger wrote: < I read your note about a common PD chemistry profile.> <I am a statistician and can manage a database. I would be willing> <to collect such data and analyze it if it is felt by the> <members that it would be helpful and if the Physicians on the> <list think there is any promise in doing this. However, I think it> <would be very important to also have data from a control group> <of comparable ages and sex as the PD patients. We would also need> <other information such as co-morbid illnesses, duration of PD, etc.> < I think it sounds like a very interesting and challenging idea> <but we would need lots of feedback from other researchers on the list> <to initiate it. I know they are there because I can tell from their> <interests and comments.> Susan Hamburger's posting expressed concern about drawing conclusions from clinical test results without including similar data from the proper healthy controls. Such an undertaking also requires taking into consideration patient and control group demographics as well as other diseases or conditions afflicting individuals whose test results are being scrutinized for trends or indications. Please exercise care if and when you choose to gather and then interpret such information. Regards, Joe Irr ([log in to unmask])