Finding the Winning Factors - Adjusted Net Passing Yards per Attempt

First off, I want to thank everyone for their ideas last week, and plan on looking at all of the suggestions (except Point scored vs. Points allowed, smart ass).  I've also slightly modified my title.  As monstersbox pointed out, there really isn't 1 factor that will tell us everything we want to know; it's a combination of factors, so that's what we'll be looking at.  Bobman, I answered your methodology question as well.

The first stat I'm going to look at is Adjusted Net Passing Yards / Attempt.  This is a stat contrived from Pro-Football-Reference.com, and here is exactly what it is:

(pass yards + 20*(pass TD) - 45*(interceptions thrown) - sack yards) / (passing attempts + sacks)

The reasoning behind picking this stat is it includes 5 different passing stats into one number, really only leaving out fumbles in what a QB does.  I'm also guessing the guys at PFR have done some research on this, making this a valuable stat.  I certainly found this out after crunching the numbers.

I've compiled stats since 1996 (13 seasons), which is just over 6,500 games.  I'm going to post some overall observations, then post the tables with some more thoughts after jump.  Here are my thoughts and findings:

• The overall average for the NFL over the past 13 seasons is 5.34 / att.  As a point of reference, straight yards / attempt is 6.3.  This makes sense, as ANPY/A takes into account INTs and Sacks, so it should be a little lower.
• Guess which team is #1 overall offensively?  That Manning guy is pretty good.  With an average of 6.75 / att, they exceed the NFL average for yds/att, which is simply amazing.  This number is so high, the difference between the Colts and the Packers (#2) is larger than the difference between the Packers and the Eagles (#16)!
• Defensively, the Colts ranked 23rd at 5.57 / att.  Not as good as I was hoping for, but the Colts defense struggled for some of those early years.  #1 Overall?  Tampa Bay at 4.38 / att.
• When a team's offense is over the average, they are 2304-971-2, which is a Win Percentage of 70.3%, which is pretty damn good.  Defensively, holding the other team below the average has a record of 2289-948-6, which is a Win Percentage of 70.7%, almost exactly the same as the offense.  What happens when you do both?  1521-186, or 89.1%.  I think this is a keeper.
• The best game over the past 13 seasons?  Week 1 of 2005, where Ben Roethlisberger had an amazing 23.5 / att against the Titans.  Manning's best game was in Week 10, 2002 against the Eagles, at 16.5 / att.  The worst game?  None other than Ryan Leaf at -6.4 / att. Can't say I'm shocked.
• Lastly, I wanted to see the offensive stats over the past 10 seasons, which are Peyton's years minus his rookie year, to see just how much better he's been over the rest of the league.  Here's the top 3 teams since 1999:

  Team	Pass Yds	Sack Yds	TD	INT	Pass Atts	Sacked	ANYP/A
  Colts	43064	1268	318	138	5585	194	7.258
  Chiefs	38324	2150	226	154	5247	341	6.042
  Patriots	38323	2190	266	141	5412	364	6.078

  That is more than 1.2 yards more per attempt than the 2nd place team (the Patriots).  Simply unbelievable.
  

After the jump you'll see the offensive and defensive numbers for each team, as well as Win/Loss records when going above/below the league average.  Click on the headers to sort.

Here are the Offensive Numbers:

And the Defensive Numbers:

Here are the Win/Loss records of teams when they go above/below average:

And finally, Win/Loss records when the offense is above average, and the defense holds the other team below average (you'll have to click the link to see it, as I've hit my limit of characters).