I question the usefullness of calculating the average. The doctor already knows what a baseline glucose level is supposed to be, I suspect he would be more intrested in viewing just a raw plot of the data over whatever period of time the tests where taken over, it should be immediately visually apparent where the spikes are, and if the glucose levels are generally below or above the norm... blue_cowdawg has your physician given you any indication on what data would be of interest to him/her?
daN.