This study aimed to assess the impact of the Video Assistant Referee (VAR) system on soccer match statistics during the Brazilian Serie A/first division, using nine years of retrospective data from 3420 matches. Between 2015 and 2018, 1520 matches were played without VAR, while from 2019 to 2023, 1900 matches included using the VAR system. The variables include fouls, goals, offsides, penalties, playing time in each half, total playing time, and red and yellow cards. The data were obtained through an API and cross-verified with match summaries. A generalized linear model and pairwise z-tests were applied to compare seasons before and after the implementation of VAR, with a 95% significance level. The results revealed that VAR reduced the number of offsides and increased playing time in both halves, resulting in longer overall match durations. No significant changes were observed in yellow cards, red cards, penalties, or goals. These findings are consistent with results reported in other major leagues, suggesting that cultural factors may play a role in how VAR influences match statistics across different contexts.
SpitzJPutKWagemansJ, et al.Visual search behaviors of association football referees during assessment of foul play situations. Cogn Res2016; 1: 12. DOI: https://doi.org/10.1186/s41235-016-0013-8.
NevillABalmerNMark WilliamsA. The influence of crowd noise and experience upon refereeing decisions in football. Psychol Sport Exerc2017; 3: 261–272.
4.
LexHPizzeraAKurtesM, et al.Influence of players’ vocalisations on soccer referees’ decisions. Eur J Sport Sci2015; 15: 424–428.
5.
Lago-PeñasCReyEKalénA. How does video assistant referee (VAR) modify the game in elite soccer?Int J Perform Anal Sport2019; 19: 646–653.
6.
Fédération Internationale de Football Association. Laws of the Game. FIFA, 2018.
7.
DyerB. The controversy of sports technology: a systematic review. SpringerPlus2015; 4: 524.
8.
SpitzJWagemansJMemmertD, et al.Video assistant referees (VAR): the impact of technology on decision making in association football referees. J Sports Sci2021; 39: 147–153.
9.
HanBChenQLago-PeñasC, et al.The influence of the video assistant referee on the chinese super league. Int J Sports Sci Coach2020; 15: 662–668.
10.
Lago-PeñasCGómezMPollardR. The effect of the video assistant referee on referee’s decisions in the spanish laLiga. Int J Sports Sci Coach2021; 16: 824–829.
11.
GasparettoTLoktionovK. Does the video assistant referee (VAR) mitigate referee bias on professional football?PLoS ONE2023; 18: e0294507.
12.
RunseweILatifiMAhsanM, et al.Machine learning for predicting key factors to identify misinformation in football transfer news. Computers2024; 13: 127.
13.
CorreiaHAPontesDHenrique BritoJ. Face recognition in online soccer streaming for piracy detection. Multimed Tools Appl2024. DOI: https://doi.org/10.1007/s11042-024-20389-3.
14.
GarlitsJMcAfeeSTaylorJA, et al.Statistical approaches for establishing appropriate immunogenicity assay cut points: impact of sample distribution, sample size, and outlier removal. AAPS J2023; 25: 37.
15.
CohenJ. Statistical power analysis for the behavioral sciences. 0 ed. Routledge, 2013, ISBN 978-1-134-74270-7. DOI: https://doi.org/10.4324/9780203771587.
16.
OudejansRRDVerheijenRBakkerFC, et al.Errors in judging ‘offside’ in football. Nature2000; 404: 33–33.
17.
HelsenWGilisBWestonM. Errors in judging “offside” in association football: test of the optical error versus the perceptual flash-lag hypothesis. J Sports Sci2006; 24: 521–528.
18.
HafeezAHafeezUAminA, et al.VAR technology in english football; implications of intervening in a fast-moving game. Int Sports Stud2022; 44: 87–97.
19.
OliveiraMDambrozFSantosR, et al.VAR implementation and soccer team performance: a comparison between the 2014 and 2018 world cups. JPES2021; 21: 3208–3213.
20.
NlanduT. The fallacies of the assumptions behind the arguments for goal-line technology in soccer. Sport, Ethics Philos2012; 6: 451–466.
21.
SvantessonDJB. Could technology resurrect the dignity of the FIFA world cup refereeing?Comput Sec Rev2014; 30: 569–573.
22.
ErrekagorriICastellanoJEcheazarraI, et al.The effects of the video assistant referee system (VAR) on the playing time, technical-tactical and physical performance in elite soccer. Int J Perform Anal Sport2020; 20: 808–817.
23.
DellalAChamariKWongDP, et al.Comparison of physical and technical performance in european soccer match-play: FA premier league and la liga. Eur J Sport Sci2011; 11: 51–59.
24.
MorgansRJuWRadnorJ, et al.The positional demands of explosive actions in elite soccer: comparison of English premier league and French ligue 1. Biol Sport2025; 42: 81–87.
25.
Ponce-BordónJCLópez-GajardoMALobo-TriviñoD, et al.Longitudinal match running performance analysis of soccer in professional european leagues: a systematic review. Int J Perfor Anal Sport2024; 24: 601–625.
26.
González-RodenasJMoreno-PérezVCampoRLD, et al.Evolution of tactics in professional soccer: an analysis of team formations from 2012 to 2021 in the spanish laLiga. J Hum Kinet2023; 87: 207–216.
27.
MouraFA. The video assistant referee (VAR) in soccer: where is the biomechanics?J Phys Educ2023; 34: 1–9.
28.
BilalicMGrafMVaciN. The effect of COVID-19 on home advantage in high- and low-stake situations: Evidence from the european national football competitions. Psychol Sport Exerc2023; 69: 102492.
29.
LeitnerMCRichlanF. No fans–no pressure: referees in professional football during the COVID-19 pandemic. Front Sports Act Living2021; 3: 720488.
