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.
13. Swansea City - Dirty rating total score: 90.5
Fouls: 145. Yellow cards: 18. Yellow then Red cards: 0. Straight red cards: 0. Photo: Harry Trump
14. Preston North End - Dirty rating total score: 90.5
Fouls: 137. Yellow cards: 17. Yellow then Red cards: 0. Straight red cards: 1. Photo: Warren Little
15. Blackburn Rovers - Dirty rating total score: 89
Fouls: 144. Yellow cards: 17. Yellow then Red cards: 0. Straight red cards: 0. Photo: Charlotte Tattersall
16. Wycombe Wanderers - Dirty rating total score: 88
Fouls: 144. Yellow cards: 11. Yellow then Red cards: 0. Straight red cards: 1. Photo: Warren Little