Meta-analysis of the red advantage in combat sports

Peperkoorn, Leonard S; Hill, Russell A; Barton, Robert A; Pollet, Thomas V

Abstract

Research has previously documented that across a range of Olympic combat sports, wearing red is associated with a higher probability of winning contests, especially when bouts are close. Yet, the hypothesis for a red advantage has not been systematically examined across multiple tournaments. Here, we report 6,589 contest outcomes for boxing, taekwondo, and wrestling from seven Summer Olympic Games (1996–2020) and nine World Boxing Championships (2005–2021). Using meta-analytic techniques, we found 50.5% wins by red for the overall data, which was not a statistically significant bias. Analyses of close contests resulted in 51.5% red wins, also not significantly different from the null expectation of equal proportions. Before 2005, however, when the red advantage was first reported and prior to changes in particular tournament rules, there was some support for a red advantage in close contests, with 56.8% of bouts won by red. It is possible that knowledge of the effect, as well as rule changes in each of the sports, have reduced the chances of a small effect being manifested, leading to the disappearance of the red advantage in competition results.

Citation

Peperkoorn, L. S., Hill, R. A., Barton, R. A., & Pollet, T. V. (2024). Meta-analysis of the red advantage in combat sports. Scientific Reports, 14(1), Article 30822. https://doi.org/10.1038/s41598-024-81373-3

• Journal Article Type: Article
• Acceptance Date: Nov 26, 2024
• Online Publication Date: Dec 28, 2024
• Publication Date: Dec 28, 2024
• Deposit Date: Nov 26, 2024
• Publicly Available Date: Jan 6, 2025
• Journal: Scientific Reports
• Electronic ISSN: 2045-2322
• Publisher: Nature Research
• Peer Reviewed: Peer Reviewed
• Volume: 14
• Issue: 1
• Article Number: 30822
• DOI: https://doi.org/10.1038/s41598-024-81373-3
• Public URL: https://durham-repository.worktribe.com/output/3107027