What do these tournament result numbers mean?

I just got the results for my 1st USCF tournament. I lost 3, won 1, drew 1.  Thus I understand the 1.5 number in the first column.  But the other numbers in the next 2 columns -  8.0  5.5 what do they mean?  Some lady I played, initially had a 617 rating coming in, she was the only one I beat, she had all 5 losses, and ended up with a 1331 rating to my final rating of 1274.  How could this be?  Her two mystery numbers were 10.5 and 7.5   

Can anyone please tell me what these numbers mean and how she got a higher final rating?  Thanks.  (I was of course unrated before the tourney)

BTW, here were the winners numbers (he won all 5 games) 2162  5.0 14.5 12.5   1885.5  (his starting rating, score for all 5 wins, the 2 mystery #'s and his final rating score.) 

And one lady had 1935  3.5  18.5  15.5   1936  (she won, won, draw, won, loss) 

How about a link to your USCF page? You'd be surprised how many David Williams there are in the world.

I edited a bit SilverSurfer.  These numbers were just for our tournament.  There were 45 in the tourney.

My guess is the two "mystery numbers" are tiebreaker scores.  One tiebreaker might be the number of games your opponents won, for example.

Are you sure the final number is the final rating score?  It might instead be the "performance rating" of just this tournament.  If her opponents had an average rating of 1731, then even with all losses she would have a performance rating of 400 points below that, or 1331.  According to the USCF website, her rating went from 840 to 812.

Actually, my new guess on the last number is that it's the average of your opponent's ratings (which might also be a tiebreaker.)  That explains the decimal point, and how the guy rated 2100+ got a number below 1900 after winning all 5 games.

I"m not sure about that final rating, David.  I've never heard of a performance rating.  I just checked the offical USCF ratings, and our tournament has not hit it yet. So I wonder how a first timers performance rating will compare to their actual USCF rating?  Same? 

The performance rating should be the same as your new rating if you were previously unrated, but I really think it's the average opponent's rating.  I calculated it for the top guy and it's 1883.2, which is pretty close to the 1885.5 that he got in that column.  (It probably doesn't match exactly because some people may have played in other tournaments between when the ratings supplement came out and the actual tournament, slightly changing their ratings.)

Thanks David and Shadow.  Below is the report.  It just seemed odd between my results #39 and the #45's results where she lost every game but scored higher on that performance rating.  http://www.coloradochess.com/events/Pikes-Peak-Open-2012.shtml