Luff from Champion Data on SEN:
* The team that has won the contested footy in a match this year has won 78% of the time.
* Contested footy consists of:
   - Contested ball won at ground level - 70%  (includes both 'hard ball gets' and 'loose ball' gets at ground level)
   - Contested marking - 11%
   - Free kicks won in a contest.
   - Ruck hitouts that go to a teammate.
*
 Contested footy      Games
  plus differential       Won %         1-5                   57% 
         5-10                 62%
        10-15                66%
          16                   79%
          16+                80+%
* Contested footy differential per club:
https://twitter.com/TheRunHome