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 Luton Town and their divisional rivals rank in the table.
1. Bristol City - Dirty rating total score: 65.5
Fouls: 113. Yellow cards: 9. Yellow then Red cards: 0. Straight red cards: 0. Photo: Michael Steele
2. Millwall - Dirty rating total score: 69
Fouls: 114. Yellow cards: 12. Yellow then Red cards: 0. Straight red cards: 0. Photo: James Chance
3. Reading - Dirty rating total score: 73
Fouls: 116. Yellow cards: 15. Yellow then Red cards: 0. Straight red cards: 0. Photo: Warren Little
4. Derby County - Dirty rating total score: 78.5
Fouls: 121. Yellow cards: 18. Yellow then Red cards: 0. Straight red cards: 0. Photo: Mike Hewitt