One thing to look at depending on the number of machines you have in the program is the percentage that meet or exceed the recommended ISO cleanliness code. That is not only a good start on oil condition but also shows how you treat your machines-are they kept clean and water free, do you have good breathers installed and are you filtering any top off oil. There are also the sampling indicators-% on time; % missed; number of resamples required per year due to inadequate sampling locations or techniques. Deferred oil changes are always a good thing to point out to management -it saves them $$$.
There are quite few more you can get into but not knowing the details of your program or it's maturity its tough to recommend specifics.