statistics shows various useful
information about your character.
None of the information it shows
is stuff that is not contained
in the documentation.

As of now, it shows how much
experience you need for your next
level.  It also shows
natural, real, and maximum
statistic values.

Your natural stat is the stat
without any items/spells applied.

Real is what the current value is
(same as in the stat window.)

Maximum is the maximum value
for your natural stat.