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Embarrassingly basic question about cladistic analysis



I'm sure plenty of people here can answer this ...

When a paper presents a cladistic analysis and says something like
"This analysis produced 72 equally most parsimonious trees (MPTs) with
length = 783, consistency index (CI) = 0.526 and retention index (RI)
= 0.687", where are the CI and RI values taken from?  Because as I
understand it, each of those 72 MPTs has its own CI and RI, correct?
Do people just pick one of the MPTs at random and report its
statistics?  Do they take the highest CI and the lowest RI that occur
in any of the MPTs?  Do they report the statistics of a consensus
tree?  Or what.

Thanks, guys!

 _/|_    ___________________________________________________________________
/o ) \/  Mike Taylor    <mike@indexdata.com>    http://www.miketaylor.org.uk
)_v__/\  "He was a quintessentially Anglican archbishop - quite worldly,
         quite gossipy, extremely decent, undogmatic, kind, conscientious,
         unvisionary, patriotic" -- Telegraph's obituary for Archbishop
         Runcie.