Table 1

Number of matches and cards during the 2014 FIFA World Cup matches played under low, medium and high environmental stress

Environmental stress
LowModerateHigh
Absolute values
 Number of matches282016
 Total number of cards775652
  Red cards0*34
  Yellow cards775348
Percentages
 Number of matches43.831.325.0
 Total number of cards41.630.328.1
  Red cards0.042.957.1
  Yellow cards43.329.827.0
  • *p<0.05 versus expected with Fischer's exact test.