ipfstat question

I'm developing a Big Brother monitoring script that will collect and display the output from the 'ipfstat -s' command, and I'd like to include descriptive text for each of the statistics. Can anyone provide me with brief descriptions of the following statistics?

IP state statistics:
TCP
UDP
ICMP
hits
misses
maximum
no memory
max bucket
active
expired
closed

State table bucket statistics:
in use
bucket usage
minimal length
maximal length
average length

Thanks,

Jim Lose
Time Warner Cable
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