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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