There are many variables which go into a team/player's propensity to foul. In no particular order:
- team defense played (zone, man, press)
- defensive positioning (inside v. outside)
- player's defensive ratings
- player's defensive IQ
- speed
- athleticism
- home/away
- opponent's offense played
- opponent's 3 pt setting (more 3s = less fouls, less 3s=more fouls)
- opponent's offensive ratings (low post, perimeter)
- opponent's offensive IQ
- opponent's speed
- opponent's athleticism