Finding NFL Halftime Score Tie Statistics: A Search Guide

Question
Where can I find NFL stats that would tell me how often the scores are tied at half time?
I have looked at www.NFL.com and www.espn.com and can't find out.
I am from the UK.
Many thanks if you can help.
Matt

Answer
Outside of looking at the box-scores of the individual games, I don't know of any centralized database for half-time stats.  The NFL keeps statistical records based on team and individual performace by game, with no distinction for halftime.  I'm sorry I can't help you.