http://m.ranker.com/list/2013-nfl-season-best-defense--v1/crsone1,
Arizona Cardinals
9.5
Chicago Bears
14.13
Cincinnati Bengals
10.31
Denver Broncos
11.5
Houston Texans
9.63
New England Patriots
11.19
San Diego Chargers
10.31
San Francisco 49ers
9.69
Seattle Seahawks
11.63
St. Louis Rams
9.44