[QUOTE=Prof Meyer;24715]
Here are same numbers for favorites:
more than 21 points: 69 times
exactly 21 points: 13 times
exactly 20 points: 11 times
below 20 points: 62 times
and for the underdogs:
more than 21 points: 45 times
exactly 21 points: 2 times
exactly 20 points: 5 times
below 20 points: 49 times
Your observation is correct. When a team total is 20.5, the OVER on the favorite is 82-73 ATS and the UNDER on the dog is 54-47 ATS.