Referee decision for different incident types caused by opponent-to-player contact from video analysis of all games (n=240 each season)
| 2010 | 2011 | 2010 vs 2011 | |||
|---|---|---|---|---|---|
| Incidents | Percentage | Incidents | Percentage | p Value | |
| Opponent-to-player contact (n=1421) | |||||
| Free kick | 379 | 52 | 367 | 53 | 0.50 |
| Sanctioned | 128 | 34 | 114 | 31 | 0.38 |
| Passive tackling incidents (n=724) | |||||
| Free kick | 253 | 67 | 262 | 76 | 0.01 |
| Sanctioned | 108 | 43 | 103 | 39 | 0.44 |
| Arm-to-head contact (n=188) | |||||
| Free kick | 38 | 35 | 30 | 38 | 0.66 |
| Sanctioned | 6 | 16 | 4 | 13 | 0.89 |
| Arm-to-head contact in heading duels (n=131) | |||||
| Free kick | 34 | 41 | 17 | 36 | 0.63 |
| Sanctioned | 5 | 15 | 1 | 6 | 0.36 |
Proportions were compared using a χ2 test.