Where does Appointment+ Store Additional Field Data?

Where does Appointment+ Store Additional Field Data?
Made an Additional_Field called "DOB" but I can't figure out where it stores that data.
I basically need to export the appointment to XML with all field data so that it can be ported into an EMR. But I can't seem to figure out where this data is being stored in the database. I tried a general regex search for known values but i figure you must hav encoded it or something maybe?