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Default automatically updating graphs based upon conditional variables

We have patients that have two variables assigned to them based upon results
of testing.
The variables are numbers between 1-6 and there are always 2 numbers
assigned to each patient.
We need to set up a histogram chart that automatically updates each time a
new patient is added to the database.
The histogram should reflect the addition of the new patient, and adjust the
graph to reflect the HIGHER of the two numbers assigned to the patient.
Example:
Patient A: 4, 3
Patient A is thus a "4"
one new "4" patient is added to the histgram to represent this patient.

Anyone know how to do this?