Table 1. Themes identified by soccer referees during interviews. Themes Consensus Number of units % of units Crowd factors 5/5 37 20.3 Accuracy/Error 5/5 27 14.8 Experience 5/5 21 11.5 Regulations 5/5 18 9.9 Opinion 5/5 16 8.8 Concentration/Avoidance 5/5 9 4.9 Player reaction 4/5 13 7.1 Control 4/5 13 7.1 Professionalism 4/5 8 4.4 Personality 3/5 8 4.4 Personal life 3/5 6 3.3 Environmental factors 3/5 5 2.8 Crowd interaction 2/5 3 1.6