We've taken a look at the number of yellow and red cards Championship sides have had this season, as well as the total number of fouls (via WhoScored data), and awarded half a point for a foul, one for a yellow, three for a yellow/red and five for a straight red to calculate the 'dirty' rating. Here's a look at how Preston North End and their divisional rivals rank in the table.
5. Stoke City - Dirty rating total score: 96
Fouls: 142. Yellow cards: 20. Yellow then Red cards: 0. Straight red cards: 1. Photo: Alex Livesey
6. Nottingham Forest - Dirty rating total score: 96
Fouls: 156. Yellow cards: 13. Yellow then Red cards: 0. Straight red cards: 1. Photo: Laurence Griffiths
7. Luton Town - Dirty rating total score: 94
Fouls: 144. Yellow cards: 22. Yellow then Red cards: 0. Straight red cards: 0. Photo: Naomi Baker
8. Norwich City - Dirty rating total score: 93
Fouls: 142. Yellow cards: 17. Yellow then Red cards: 0. Straight red cards: 1. Photo: Michael Steele